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Q.

A quantity of 30 ml of 20% alcohol is mixed with 20 ml of 25% alcohol. What is the strength of alcohol in the mixture?


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a

20%

b

27%

c

30%

d

22% 

answer is D.

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Detailed Solution

Volume of alcohol in first quantity = 20% of 30 = 6 ml
Volume of alcohol in second quantity = 25% of 20 = 5 ml
Total Volume = Volume of first quantity + Volume of second quantity
= 30+20 = 50 ml
Total Volume of alcohol = Volume of alcohol in first quantity + Volume of alcohol in second quantity
= 6 + 5 = 11 ml
% of alcohol = 1150×100=22%
 
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