Correct Answer - Option 4 : 10
Given:
Mixture of acid and alcohol in the ratio = 3 : 2
Alcohol adding in the mixture = 10 litres
After adding water the ratio of mixture = 3 : 5
Calculation:
Let acid and alcohol in the mixture be 3x and 2x respectively
According to question
⇒ 3x/(2x + 10) = 3/5
⇒ 15x = 6x + 30
⇒ 9x = 30
⇒ x = 10/3
The quantity of acid in the mixture = 10/3 × 3
⇒ 10
∴ The quantity of acid in the original solution is 10.