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Question
A sample of alcohol has 40% water, and another sample has 60% water. If equal volumes of both the samples are combined, what is the percentage of water in the new sample?
A
50 %.
B
52 %.
C
48 %.
D
54 %.
Soln.
Ans: a
Ans: a
If 100 units of both alcohol are combined, there will be 100 units of water in 200 units of the new sample. The percentage of water is $100/200$ × 100 = 50%.