140 liters 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:

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5 liters

4 liters

3 liters

none

answer is B.

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Detailed Solution

Concept- Percentage calculate the value of x by simply balancing the acid content of the initial and final solutions.
Percentage=quantityTotal100
We'll assume that the combination receives an addition of x liters of water in order to solve this issue. Now, there is 87.5 percent acid in the final solution (100 - 12.5% = 87.5 percent) . Because the amount of acid is conserved, we can A different formula must be used to determine the percentage of a number, such as P percent of number=X, where X represents the necessary percentage.
If we don't use the percent symbol, we must write the equation above as P/100(Number) =X.
Let the amount of water required be x.
When the water amount is increased to 12.5%, the acid amount
100-12.5=87.5%(90/100) ×140=(87.5/100) ×(x+140)
126=0.875x+122.5
126-122.5=0.875x
3.5=0.875x
x=4
Hence, the correct option is 2) 4 liters

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