31). Two equal containers filled with mixtures of milk and water in the ratio of 4: 1 and 1: 3 respectively were emptied into a larger container. What is the ratio of milk and Water in the larger container?
| A). 21 : 19 |
| B). 30 : 10 |
| C). 25 : 15 |
| D). 35 : 5 |
|
32). Fresh fruits contain 72% water by weight and dry fruits contain 20% water by weight. How many Kgs. of dry fruits can be obtained from 100 Kgs. of fresh fruits?
| A). 40 Kgs |
| B). 60 Kgs |
| C). 70 Kgs |
| D). 35 Kgs |
|
33). There are two alloys of copper and zinc. In the first alloy, the ratio of copper to zinc is 3 : 4 and in the second alloy the ratio of copper to zinc is 6 : 1. In what proportion should these two alloys be mixed, so that a new alloy containing equal parts of copper and zinc may be obtained?
| A). 5 : 1 |
| B). 7 : 2 |
| C). 6 : 3 |
| D). 4 : 3 |
|
34). There are two alloys of copper and zinc containing copper and zinc in the ratio of 1:2 and 3:5 respectively. If 12 Kgs. of the first alloy and 16 Kgs. of the second alloy are mixed and some more pure zinc is added, the ratio of copper to zinc in the resultant alloy becomes 2 : 5. How many Kgs. of pure zinc was added?
| A). 6 Kgs. |
| B). 9 Kgs. |
| C). 7 Kgs. |
| D). 8 Kgs. |
|
35). A 24 liters cylinder containing ethylene and acetylene contains 25% ethylene by volume. A few liters of the mixture is released and replaced with equal amount of acetylene. If this process is repeated once, the cylinder is found to contain 16% ethylene by volume. How many liters of the gaseous mixture was released each time?
| A). 6.2 litres |
| B). 5.3 litres |
| C). 7.2 litres |
| D). 4.8 litres |
|
36). In what proportion should a merchant mix two kinds of tea that cost Rs.4 per lb and Rs.7 per lb, so that the mixture costs Rs.6 per lb?
| A). 2 : 3 |
| B). 1 : 2 |
| C). 5 : 4 |
| D). 3 : 5 |
|
37). What quantity of coffee at Rs.13/kg should be mixed with 10 kg of coffee at Rs.18/kg, to make a mixture of coffee worth Rs.1/kg?
| A). 20 Kgs. |
| B). 30 Kgs. |
| C). 25 Kgs. |
| D). 10 Kgs. |
|
38). A money lender lends a part of a sum of Rs. 8000 at 5% interest and the rest at 7% interest. If the total annual interest received on the sum at the end of a year is Rs.450, how much did he lend at 7% interest?
| A). Rs.4500 |
| B). Rs.6000 |
| C). Rs.2500 |
| D). Rs.3000 |
|
39). The ratio of milk and water in a 30 liters mixture is 7 :3. How much water shOuld be added to the mixture to make it a mixture containing equal proportions of milk and water?
| A). 12 Litres |
| B). 9 Litres |
| C). 15 Litres |
| D). 21 Litres |
|
40). There are 2 varieites of tea, one that costs Rs.3.30/kg and another that costs Rs.4.50/kg. In what ratio should a grocer mix the two varieties so that by selling the mixture at Rs.4.40/kg, he will make a profit of 10%?
| A). 3 : 5 |
| B). 4 : 7 |
| C). 2 : 5 |
| D). 5 : 7 |
|
