Tea costing Rs. 136 a kilogram is mixed with tea costing Rs. 141 a kilogram in the ratio 2 : 3. The cost of one kilogram of the mixture is

• Rs. 138

• Rs. 138.50

• Rs. 139

• Rs. 139

A tradesman, who was selling one kind of tea at Rs. 96 per kg with a loss of 20% and another kind at Rs. 140 per kg with a gain of 25% mixes the two together in equal ratio. He sells the mixed tea at Rs. 174 per kg. His gain is

• 50%

• 45%

• 30%

• 30%

The percentage of metals in mine of lead ore is 60%. Now, the percentage of silver is  of metals and the rest is lead. If the mass of ore extracted from this mine is 8000 kg, the mass (in kg) of lead is

• 4763

• 4764

• 4762

• 4762

Two alloys contain tin and iron in the ratio of 1:2 and  2:3. If the two alloys are mixed in the proportion of 3 : 4 respectively (by weight), the ratio of tin and iron in the newly formed alloy is

• 13:22

• 14:25

• 10:21

• 10:21

In two types of brass, the ratios of Copper to Zinc are 8:3 and 15:7 respectively. If the two types of brass be melted and mixed in the ratio 5:2 a new type of brass is obtained. The ratio of Copper to Zinc in this new type of brass is

• 3 : 2

• 2 : 3

• 3 : 4

• 3 : 4

An army of 12000 consists of Europeans and Indians. The average height of a European is 5ft 10 inches and that of an Indian is 5ft 9 inches and that of the whole army is 5ft  inches. Then the number of Indians in the army is

• 3000

• 4000

• 5500

• 5500

Two bottles contain acid and water in the ratio 2 : 3 and 1 : 2 respectively. These are mixed in the ratio 1 : 3. What is the ratio of acid and water in the new mixture?

• 7 : 13

• 11 : 57

• 23 : 37

• 23 : 37

Two types of tea costing ₹ 180 per kg and ₹ 280 per kg should be mixed in the ratio so that the mixture obtained, sold at ₹ 320 per kg to earn a profit of 20% is

• 3 : 13

• 1 : 13

• 4 : 13

• 4 : 13

9.

There are two containers of equal capacity. The ratio of milk to water in the first container is 3 : 1, in the second container 5 : 2. If they are mixed up, the ratio of milk to water in the mixture will be

• 28 : 41

• 41 : 28

• 15 : 41

• 15 : 41

20 litres of a mixture contains 20% alcohol and the rest water. If 4 litres of water be mixed in it, the percentage of alcohol in the new mixture will be

• 
• 

• 25%

• 25%