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A can contains a mixture of 2 liquids A and B in the ratio 7 : 5. 9 litres of the mixture are drawn and replaced by B. Now the ratio is 7 :…

2823Hard DSSSB TGT Computer Science 0 replies

A can contains a mixture of 2 liquids A and B in the ratio 7 : 5. 9 litres of the mixture are drawn and replaced by B. Now the ratio is 7 : 9. What was the volume of liquid A contained by the mixture originally?

Correct answer: C

Explanation

Let the total be T. A left = 7(T - 9)/12 and B left = 5(T - 9)/12 + 9. Setting the ratio to 7 : 9 gives T - 9 = 27, so T = 36 and A = 36 x 7/12 = 21 litres.

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