Question

A vessel containing 3 litres of a salt-solution contains 10% salt. How much water should be added more to the salt solution so that it contains 5% of salt?
1. 1.5 litres
2. 2.5 litres
3. 3.0 litres
4. 3.5 litres

Answer 1

Correct Answer - Option 3 : 3.0 litres

Given:

Quantity of solution = 3 l

Salt content in the solution = 10%

Calculation:

Salt content initially = (0.1)3 = 0.3 l

Water = 3 - 0.3 = 2.7 l

Let water to be added is x litres to make it 5% salt-solution

Then, (2.7 + x)/0.3 = 95/5

⇒ 5.7 = 2.7 + x

⇒ x = 3

∴ Water to be added is 3 litres