Percentage Practice Test 2 with solutions

Question : 35 of 40

Marks: +1, -0

A 78 litre mixture of milk and water contains 20% of water. What quantity of additional water be mixed so that water content in the mixture becomes 30%?

5 litre
7 litre
8 litre
11.1 litre

Validate

Solution:

Let x litre water will be added; then

20/100×78+x=30/100(78+x)

⇒2(78+5x)=3(78+x)

⇒7x=78

⇒x=78/7=11.1\litre

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