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11.

A 24 litre mixture contains water : milk in the ratio of 3 : 5.How much water must be added to this mixture to reverse this ratio?

A) 20 litres

B) 24 litres

C) 18 litres

D) 16 litres

12.

To a 50 litre mixture containing water and milk in the ratio 2 : 3.30 litre of milk is added.What is the ratio of milk : water in the resultant solution?

A) 3 : 1

B) 2 : 1

C) 1 : 3

D) 1 : 2

13.

Zinc and copper are in the ratio of 5 : 3 in 200 gm of an alloy.How much grams of copper be added to make the ratio as 3 : 5?

A) $133\frac{1}{3}$

B) $\frac{1}{200}$

C) $72$

D) $66$

14.

Two litres of a mixture of spirit and water contains 12% water.This is added to 3 litres of another mixture of spirit and water containing 5% of water.Find the percentage ofwater in the resulting mixture.

A) $7\frac{2}{5}%$

B) $7\frac{3}{5}%$

C) $7\frac{4}{5}%$

D) $7%$

15.

A painter mixes blue paint with white paint so that the mixture contains 10% blue paint.In a mixture of 40 litres paint, how many litres of blue paintshould be added, so that the mixture contains 20% of blue paint?

A) 2.5 litres

B) 4 litres

C) 5 litres

D) 2 litres

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