Question

How many kilograms of water must be added to 25 kilograms of a 15% salt solution to produce a 5% solution ?

Answer 1

50kg

Explanation:

25 kg of a 15% salt solution

25kg * 15%

25kg * 15/100 = 3.75 kg

3.75kg * 100/5

3.75 * 20 = 75

Mass of water in kg increased from 25kg to 75kg

75kg - 25kg = 50kg of water must be added.