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Question

140 litres of an acid contains 90% of acid and rest water.The amount of water added to make the water 12.5% of the resulting mixture is

A
5 litres
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B
4 litres
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C
3 litres
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D
none
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Solution

The correct option is C 4 litres
Let x amount of water required.

When the water amount is increased to 12.5%, the acid amount
10012.5=87.5%
90100×140=87.5100×(x+140)
126=0.875x+122.5
0.875x=126122.5
0.875x=3.5
x=4 liters of water added.

Hence, this is the answer.

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