Percentage Practice Test 5 with solutions

Question : 4 of 40

Marks: +1, -0

Milk contains 5% water. What quantity of pure milk should be added to 10 litres of milk to reduce this to 2%?

Solution:

Let x litre of the milk be added, then

95/100×10+x=98/100(10+x)

⇒9.5+x=9.8=0.98x

⇒0.02x=0.3⇒x=15\litres

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