Question : In a mixture of 25 litres, the ratio of acid to water is 4 : 1. Another 3 litres of water is added. The ratio of acid to water in the new mixture is:
Option 1: 5 : 2
Option 2: 2 : 5
Option 3: 3 : 5
Option 4: 5 : 3
Correct Answer: 5 : 2
Solution :
Given: In a mixture of 25 litres, the ratio of acid to water is 4 : 1.
Quantity of acid = $25×\frac{4}{4+1}=25×\frac{4}{5}$ = 20 litres
Quantity of water = $25×\frac{1}{4+1}=25×\frac{1}{5}$ = 5 litres
3 litres of water was added to the mixture, i.e., 5 + 3 = 8
$\therefore$ The new ratio is 20 : 8 = 5 : 2
Hence, the correct answer is 5 : 2.
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