Percentage Practice Test 7 with solutions

Question : 12 of 40

Marks: +1, -0

A mixture of 40 litres of milk and water contains 10% water. How much water must be added to make water 20% in the new mixture?

Solution:

Water = 10/100 × 40 = 4 litres
Let x litres of water be added,
Then,

x + 4 =20/100 (40+x)

⇒5x + 20 = 40 + x

⇒ x = 5

litres

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