41). A merchant sells 40 kgs of rice, part of it at 4% profit and the remaining at 12% profit. If he has a net gain of 10%, what is the quantity of rice sold at 4% profit?
| A). 20 Kgs. |
| B). 10 Kgs. |
| C). 15 Kgs. |
| D). 5 Kgs. |
|
42). 6 litres from a 30 litre mixture of milk and water in the ratio 3 : 2 is replaced with milk. The operation is repeated once. What will be the ratio of milk and water in the resultant mixture?
| A). 22.32 : 7.68 |
| B). 24.24 : 5.76 |
| C). 25.25 : 4.75 |
| D). 21.35 : 8.65 |
|
43). Two alloys of aluminium and copper have aluminium and copper in the ratio 3 :2 and 3 :4 respectively. In what proportion should these two alloys be mixed to get a new alloy in which the ratio of aluminium to copper is 5 : 4?
| A). 16 : 11 |
| B). 14 : 13 |
| C). 20 : 7 |
| D). 19 : 8 |
|
44). 20 liters of 30% sulphuric acid is mixed with 10 liters of 90% sulphuric acid. What is the strength of sulphuric acid in the resultant mixture?
| A). 0.45 |
| B). 0.06 |
| C). 0.5 |
| D). 0.7 |
|
45). Five liters are taken off from a vessel full of water and replaced with pure milk. Again, five more liters of the mixture is taken and replaced with pure milk After this process, if the vessel contains water and milk in the ratio 9:16 what is the capacity of the vessel?
| A). 15 Liters |
| B). 20 Liters |
| C). 12.5 Liters |
| D). 14.6 Liters |
|
46). How many kilograms of tea worth Rs. 3. 60 per kg. must be mixed with 8 kg. of tea worth Rs. 4.20 per kg. so that by selling the mixture at Rs. 4.40 per kg. There may be a of 10%.
| A). 4 kg. |
| B). 3 kg. |
| C). 6 kg. |
| D). 8 kg. |
|
47). A mixture of 50 liters of milk and water contains 10% of water. How much water must be added to make the water 20% in the new mixture.
| A). 6 litres. |
| B). 6.25 litres. |
| C). 4 litres. |
| D). 10 litres. |
|
48). Kartilal mix 80 kg. of sugar worth of Rs.6. 75 per kg. with 120 kg. worth of Rs.8 per kg. At what rate shall he sell the mixture to gain 20%.
| A). Rs.7.50 |
| B). Rs.9.00 |
| C). Rs.8.20 |
| D). Rs.8.85 |
|
49). 20 litres of mixture contains 20% of alcohol and the rest water. If 4 litres of water be mixed with it, the percentage of alcohol in the new mixture will be
| A). 15% |
| B). \( \Large 16\frac{2}{3} \)% |
| C). 18% |
| D). 20% |
|
50). A mixture of 30 kg. of spirit and water contains 20% water. How much water must be added to this mixture to raise the percentage of water to 25%.
| A). 2 kg. |
| B). 4 kg. |
| C). 3 kg. |
| D). None of these. |
|
