A 100-litre solution contains acid and water in the ratio 3:2. Some quantity…
2025
A 100-litre solution contains acid and water in the ratio 3:2. Some quantity of this solution is removed and
replaced with pure acid. If the final ratio of acid to water becomes 7:3, how many litres of solution were replaced?
- A.
35 litres
- B.
25 litres
- C.
50 litres
- D.
20 litres
Attempted by 1 students.
Show answer & explanation
Correct answer: B
Initially acid = 60 L and water = 40 L. If x litres are replaced, final acid = 60 - 0.6x + x = 60 + 0.4x and water = 40 - 0.4x. Using (60 + 0.4x):(40 - 0.4x) = 7:3 gives x = 25.