A can contains a mixture of two liquids A and B in proportion 7:

A can contains a mixture of two liquids A and B in proportion 7:
| A can contains a mixture of two liquids A and B in proportion 7: 5. When 9 l of mixture is drawn off and the can is filled with B, the proportion of A and B becomes 7: 9. how many litres of liquid A was contained in the can initially?

A. 22 l

B. 21 l

C. 35 l

D. 38 l

Please scroll down to see the correct answer and solution guide.

Right Answer is: B

SOLUTION

Let the quantity of A and B are 7x and 5x respectively.
According to question;
Here, if we think about the question deeply,
In the 9 litres of mixture that is taken out and replaced with pure B solution
the only part changing in the mixure is the portion of A that was taken out with 9 liters and the same portion is again added in the form of B.
so,
A is reduced by the amount 9×(7/12) and the same part of A is replaced with B.

x =

So, the quantity of liquid A in the can = 7 × 3 = 21l

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