Question

How much salt should be added to 60 litres of a 20% solution of salt to increase to a 40% solution of salt?

Answer 1

Step-by-step explanation:

20% solution of 60 litres = 20 × 60 = 12ml

100

Let solution added to make 40% solution = x

12ml + x = 40

60ml + x. 100

Then by cross multiplication,

1200 + 100x = 2400 + 40x

100x - 40x = 2400 - 1200

60x =1200

x = 1200

60

x = 20ml

solution of salt to increase 40% solution = 20ml

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