A container holds 200 litres of a solution of acid and water, having 30% acid by volume. Atul replaces 20% of

Question

A container holds 200 litres of a solution of acid and water, having 30% acid by volume. Atul replaces 20% of this solution with water, then replaces 10% of the resulting solution with acid, and finally replaces 15% of the solution thus obtained, with water. The percentage of acid by volume in the final solution obtained after these three replacements, is nearest to

Select an option to reveal the answer and explanation

Accepted Answer

27. 200 L with (30%) acid ⇒ \Rightarrow ⇒ acid = 0.30 × 200 = 60 L 0.30	imes200=60 L 0.30 × 200 = 60 L Replace 20% with water: remaining acid = 60 × ( 1 − 0.20 ) = 60 × 0.8 = 48 L =60	imes(1-0.20)=60	imes0.8=48 L = 60 × ( 1 − 0.20 ) = 60 × 0.8 = 48 L . Replace 10% with pure acid: After removing 10% o