RRB Group D 8-Dec-2013 Shift 1 Solved Paper

Question : 78 of 100

Marks: +1, -0

A mixture of 40 litres of milk and water contains 10% of water. How much water should be added to this mixture so that the new mixture contains 20% water?

4 litres
5 litres
7.5 litres
None of these

Validate

Solution:

Amount of water in old mixture =4 l, amount of milk = 36 l.
Ratio of milk to water in newmixture = 80 : 20 = 4 : 1.
Let x litres of water be added in thenew mixture to get the above ratio.
Then:

\;{36}/{4+x}=\;{4}/{1} ⇒ 4 x=20 ⇒ x=5 \;\text " litres "\;

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