21.

In what proportion must a grocer mix sugar at Rs. 12 a kg and Rs. 7 a kg so as to make a mixture worth Rs. 8 a kg.?

• 7 : 12

• 1 : 4

• 2 : 3

• 2 : 3

49 kg of blended tea contains Assam and Darjeeling tea in the ratio 5 : 2. Then the quantity of Darjeeling tea to be added to the mixture to make the ratio of Assam to Darjeeling tea 2 : 1 is

• 4.5 kg

• 3.5 kg

• 5 kg

• 5 kg

A mixture contains spirit and water in the ratio of 3 : 2. If it contains 3 litre more than water, the quantity of spirit in the mixture is

• 12 litre

• 10 litre

• 9 litre

• 9 litre

A merchant buys 25 litre of milk daily at the rate of â‚¹ 12 per litre. He mixes 5 litre of water in it and sells at the rate of â‚¹ 10.40 per litre. His gain/loss is

• 8% profit

• 2% profit

• 4% profit

• 6% profit

In a mixture of 25 litres, the ratio of milk to water is 4 : 1. Another 3 litres of water is added to the mixture. The ratio of milk to water in the new mixture is

• 5 : 1

• 5 : 2 

• 5 : 3

• 5 : 4

A drum of kerosene is  full. When 30 L of kerosene is drawn from it, it remains full. The capacity of the drum is

• 120 L

• 135 L

• 150 L

• 180 L

A can contain a mixture of two liquids A and B in the ratio 7 : 5. When 9 L of mixture are drawn off and the can is filled with B, the ratio of A and B becomes 7 : 9. Litres of liquid A contained by the can initially was

• 10

• 20

• 21

• 25

An alloy contains copper, zinc and nickel in the ratio of 5 : 3  : 2. The quantity of nickel in kilogram that must be added to 100 kg of this alloy to have the new ratio 5 : 3 : 3 is

• 8

• 10

• 12

• 15

A container has 80 L of milk. From this container, 8 L of milk was taken out and replaced by water. The process was further repeated twice. The volume of the milk in the container after that is

• 58.23 L

• 85.23 L

• 58.32 L

• 85.32 L

15 L of a mixture contains alcohol and water in the ratio 1 : 4. If 3 L of water is mixed in it, the percentage of alcohol in the new mixture will be

• 15

• 

• 17

•