Given:
Acid to water ratio = 7:4 initially.
After adding 2 liters of water, the ratio becomes 7:5.
Formula Used:
Let the quantity of acid = 7x and water = 4x.
New ratio after adding 2 liters: 7x / (4x + 2) = 7/5.
Solution:
7x / (4x + 2) = 7 / 5
=> 5(7x) = 7(4x + 2)
=> 35x = 28x + 14
=> 7x = 14
=> x = 2.
Thus, the quantity of acid = 7x = 7 × 2 = 14 liters.
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