hussi9 wrote:

A Jar contains a mixture of A & B in the ratio 4:1. When 10 L of Mixture is replaced with liquid B, ratio becomes 2:3. How many liters of liquid A was present in mixture initially.

A) 12

B) 15

C) 16

D) 20

E) 25

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IIM CAT Level Question

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If we have a mixture in ratio 4:1, it must be true that we should look for a multiple of 4 as an answer.

B and E are right away out.

since we need more than 10 liters, we could have had:

8 liters of A and 2 liters of B - since we don't have 8, let's go further...

12 liters of A and 3 liters of B -> removing 10 liters -> means remove 8 of A and 2 of B -> new result is 4:11 - nope.

16 liters of A and 4 liters of B -> removing 10 liters -> means remove 8 of A and 2 of B -> we have 8 liters of A and 12 of B. or 8:12 or 4:6 or 2:3 - satisfies the condition.

answer must be C.