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All questions of Mixture & Allegations for Bank Exams Exam

A mixture of 100 litres of spirit and alcohol contains 25% alcohol. How much more alcohol should be added to the mixture to increase the percentage of alcohol to 30% in the new mixture?
  • a)
    3.33 litres
  • b)
    7.14 litres
  • c)
    5 litres
  • d)
    4 litres
Correct answer is option 'B'. Can you explain this answer?

Kavya Sharma answered
Alcohol content in the alcohol to be added = 100%
Therefore, the allegation diagram for this problem can be drawn as:
Therefore, ratio of the mixture to alcohol = 70/5 = 14/1
So, alcohol to be added = 100/14
Hence, the answer is "7.14 litres".
Choice B is the correct answer.

Two containers of equal capacity are full of a mixture of oil and water. In the first, the ratio of oil to water is 4 : 7 and in the second it is 7 : 11. Now both the mixtures are mixed in a bigger container. What is the resulting ratio of oil to water?
  • a)
    149 : 247
  • b)
    247 : 149
  • c)
    143 : 241
  • d)
    241 : 143
Correct answer is option 'A'. Can you explain this answer?

Assume the capacity of the two containers is 198 liters each. When we mix 198 liters of the first and 198 liters of the second the amount of oil would be: 198 x 4/11 + 198 x 7/18 = 72 + 77 = 149 liters. Consequently the amount of water would be 396 - 149 = 247 liters. Option (a) is correct.

8 litres are drawn from a cask full of wine and is then filled with water. This operation is performed three more times. The ratio of the quantity of wine now left in cask to that of the water is 16:65. How much wine did the cask originally hold?
  • a)
    30 litres
  • b)
    26 litres
  • c)
    24 litres
  • d)
    32 litres
Correct answer is option 'C'. Can you explain this answer?

Arya Roy answered
8 litres are drawn from a cask full of wine and is then filled with water.
This operation is performed three more times.
The ratio of the quantity of wine now left in cask to that of the water is 16 ∶ 65
Calculations:
Let the quantity of the wine in the cask originally be x litres.
After first operation, wine left in the cask = (x - 8) litres So, the ratio of the quantity of wine now left in cask to that of filled cask = 
This operation is performed three more times. Then, Wine : Water = 16 : 65 or wine : water = 16 : (16 + 65) = 81
Correct answer is 24.

How many kilograms of sugar costing Rs. 9 per kg must be mixed with 27 kg of sugar costing Rs. 7 per Kg so that there may be a gain of 10 % by selling the mixture at Rs. 9.24 per Kg ?

  • a)
    60 Kg
  • b)
    63 kg
  • c)
    58 Kg
  • d)
    56 Kg
Correct answer is option 'B'. Can you explain this answer?

C.P. of 1 kg sugar of 1st kind      C.P. of 1 kg sugar of 2nd kind

Therefore, Ratio of quantities of 1st and 2nd kind = 14 : 6 = 7 : 3. 

Let x kg of sugar of 1st kind be mixed with 27 kg of 2nd kind. 

Then, 7 : 3 = x : 27 or x = (7 x 27 / 3) = 63 kg.

Two types of oils having the rates of Rs. 4/kg and Rs. 5/kg respectively are mixed in order to produce a mixture having the rate of Rs. 4.60/kg. What should be the amount of the second type of oil if the amount of the first type of oil in the mixture is 40 kg?
  • a)
    75 kg
  • b)
    50 kg
  • c)
    60 kg
  • d)
    40 kg
Correct answer is option 'C'. Can you explain this answer?

Ravi Singh answered
Mixing Rs. 4/kg and Rs. 5/kg to get Rs. 4.6 per kg we get that the ratio of mixing is 2:3. If the first oil is 40 kg, the second would be 60 kg
Hence, by the rule of allegation they must be mixed in the ratio 40:60
if quantity of first type is 40kg , the quantity of second type will be 60 kg

A sum of Rs. 36.90 is made up of 90 coins that are either 20 paise coins or 50 paise coins. Find out how many 20 paise coins are there in the total amount,
  • a)
    47
  • b)
    43
  • c)
    27
  • d)
    63
Correct answer is option 'C'. Can you explain this answer?

Aryan Khanna answered
Let coins of 20 paisa be x
and let coins of 50 paisa be y
convert the 36. 90 RS in paisa
it will be 3690 paisa
means
20x+50y=3690 ... (1)
x+y=90 ... (2)
multiply (2) by 50 on both sides we get
50x+50y=4500
subtract (2) from (1)
20x+50y=3690
50x+50y=4500
-30x=-810
x=-810/-30
x=27
the number of coins of 20 paisa are 27

Two vessels A and B contain spirit and water in the ratio 5 : 2 and 7 : 6 respectively. Find the ratio in which these mixture be mixed to obtain a new mixture in vessel C containing spirit and water in the ration 8 : 5 ?
  • a)
    3: 4
  • b)
    4 : 3
  • c)
    9 : 7
  • d)
    7 : 9
Correct answer is option 'D'. Can you explain this answer?

Manoj Ghosh answered
Spirit in 1 litre mix of A = 5/7 litre.
Spirit in 1 litre mix of B = 7/13 litre.
Spirit in 1 litre mix of C = 8/13 litre. 
By rule of alligation we have required ratio X:Y

   X         :       Y

 5/7              7/13

 

       \          /
          (8/13)

       /          \


(1/13)     :     (9/91)

  7                      9

Therefore required ratio = 1/13 : 9/91 

= 7:9

Tea worth Rs. 126 per kg and Rs. 135 per kg are mixed with a third variety of tea in the ratio 1 : 1 : 2. If the mixture is worth Rs. 153 per kg, what is the price of the third variety per kg ?
  • a)
    Rs.182.50
  • b)
    Rs.170.5
  • c)
    Rs.175.50
  • d)
    Rs.180
Correct answer is option 'C'. Can you explain this answer?

Manoj Ghosh answered
Since first and second varieties are mixed in equal proportions.

So, their average price = Rs.
126 + 135/2
= Rs. 130.50
So, the mixture is formed by mixing two varieties, one at Rs. 130.50 per kg and the other at say, Rs. x per kg in the ratio 2 : 2, i.e., 1 : 1. We have to find x.

By the rule of alligation, we have:

 x - 153 = 22.50
 x = 175.50

In the Singapore zoo, there are deers and there are ducks. If the heads are counted, there are 180, while the legs are 448. What will be the number of deers in the zoo?
  • a)
    136
  • b)
    68
  • c)
    44
  • d)
    22
Correct answer is option 'C'. Can you explain this answer?

Aryan Khanna answered
Let x be the number of deers in the zoo
Then (180-x)be the number of ducks, as each animal and bird has one head.
Now duck has 2 legs and deer has 4 legs so
4x+2(180-x)=448
2x+360=448
X=44
No of deers=44


The price of a pen and a pencil is Rs. 35. The pen was sold at a 20% profit and the pencil at a 10% loss. If in the transaction a man gains Rs. 4, how much is cost price of the pen?
  • a)
    Rs. 10
  • b)
    Rs. 25
  • c)
    Rs. 20
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?

Ravi Singh answered
Solve using options as that would be the best way to tackle this question. Option (b) fits the situation perfectly as if we take the price of the pen as Rs. 25, the cost of the pencil would be Rs. 10. The profit in selling the pen would be Rs.5 while the loss in selling the pencil would be Rs. 1. The total profit would be Rs. 4 as stipulated by the problem.

A mixture of 125 gallons of wine and water contains 20% water. How much water must be added to the mixture in order to increase the percentage of water to 25% of the new mixture?
  • a)
    10 gals
  • b)
    8.5 gals
  • c)
    8 gals
  • d)
    8.33 gals
Correct answer is option 'D'. Can you explain this answer?

Aaditya Yadav answered
In 125 gallons we have 25 gallons water and 100 gallons wine. To increase the percentage of water to 25%, we need to reduce the percentage of wine to 75%. This means that 100 gallons of wine = 75% of the new mixture. Thus the total mixture = 133.33 gallons. Thus, we need to mx 133.33 - 125 = 8.33 gallons of water in order to make the water equivalent to 25% of the mixture.

A mixture of 70 litres of alcohol and water contains 10% of water. How much water must be added to the above mixture to make the water 12.5% of the resulting mixture?
  • a)
    1 litre
  • b)
    1.5 litre
  • c)
    2 litres
  • d)
    2.5 litres
Correct answer is option 'C'. Can you explain this answer?

Ishani Rane answered
Mixture = 70 L
Water =10% of mixture = 10% of 70 = 7 L.
Alcohol = 63 L.
Let x water added. Now, Water and Alcohol ratio will be,
(7 + x)/63 = 12.5/87.5
7 +x = 787.5/87.5
7 + x = 9
x = 2 L.
Water added = 2 L.

400 students took a mock exam in Delhi. 60% of the boys and 80% of the girls cleared the cut off in the examination. If the total percentage of students qualifying is 65%, how many girls appeared in the examination?
  • a)
    100
  • b)
    120
  • c)
    150
  • d)
    300
Correct answer is option 'A'. Can you explain this answer?

Naroj Boda answered
The ratio of boys and girls appearing for the exam can be seen to be 3:1 using the following alligation figure.
This means that out of 400 students, there must have been 100 girls who appeared in the exam.

A milk vendor has 2 cans of milk. The first contains 25% water and the rest milk. The second contains 50% water. How much milk should he mix from each of the containers so as to get 12 litres of milk such that the ratio of water to milk is 3 : 5?

  • a)
    5 litres, 7 litres
  • b)
    7litres, 4 litres
  • c)
    6litres, 6 litres
  • d)
    4litres, 8 litres
Correct answer is option 'C'. Can you explain this answer?

Ishani Rane answered
Let x and (12-x) litres of milk be mixed from the first and second container respectively
Amount of milk in x litres of the the first container = .75x
Amount of water in x litres of the the first container = .25x
Amount of milk in (12-x) litres of the the second container = .5(12-x)
Amount of water in (12-x) litres of the the second container = .5(12-x)
Ratio of water to milk = [.25x + .5(12-x)] : [.75x + .5(12-x)] = 3 : 5
⇒ (.25x+6-5x)/(.75x+6-.5x) =3/5
⇒(6−.25x)/(.25x+6) =3/5
⇒30−1.25x=.75x+18
⇒2x=12
⇒x=6
Since x = 6, 12-x = 12-6 = 6
Hence 6 and 6 litres of milk should mixed from the first and second container respectively

The average salary per head of all employees of a company is Rs. 600. The average salary of 120 officers is Rs. 4000. If the average salary per head ofthe rest of the employees is Rs. 560, find the total number of workers in the company.
  • a)
    10200
  • b)
    10320
  • c)
    10500
  • d)
    10680
Correct answer is option 'B'. Can you explain this answer?

Total no. of workers be x
Their average salary = Rs 600
Total salary of all workers = 600x
Average salary of 120 officers = Rs 4000
Total salary of 120 officers = 120 x 4000 = Rs 48000
Average salary of rest of employees = Rs 560
Total salary of these rest of employees = (x - 120)x560
⇒ (x - 120)x560 + 48000 = 600x
⇒56x - 672 + 4800 = 600x
⇒ 4x = 4184
⇒ x = 10320
Total number of workers in the factory = 10320

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