How many litres of pure acid are there in 15 litres of a 20% solution
Answers:
A) 4  B) 5  C) 2  D) 3  E) 1

Rationale: explanation : question of this type looks a bit typical , but it is too simple , as below . . . it will be 15 * 20 / 100 = 3 answer : option d
Answer: D