21). In a school, 10% of boys are equal to the one-fourth of the girls. What is the ratio of boys and girls in that school?
| A). 3:2 |
| B). 5:2 |
| C). 2:1 |
| D). 4:3 |
|
22). Income of Suman is first increased by 7% and then it is decreased by 7%. What is the change in her income?
| A). 0.49% (increase) |
| B). 0.39% (decrease) |
| C). 0.39% (increase) |
| D). 0.49% (decrease) |
|
23). 48% of the 1st number is 60% of the 2nd number. What is the ratio of the 1st number to the 2nd number?
| A). 4:7 |
| B). 3:4 |
| C). 5:4 |
| D). Couldn't be determined |
|
24). Two numbers are respectively 20% and 50% more than a 3rd number. What is the percentage of 2nd with respect to 1st?
| A). 125% |
| B). 90% |
| C). 80% |
| D). 75% |
|
25). The sum of 15% of a positive number and 20% of the same number is 126. What is one-third of that number?
| A). 360 |
| B). 1080 |
| C). 120 |
| D). 40 |
|
26). In a test, A scored 10% more than B and B scored 5% more then C. If C scored 300 marks out of 400, then A's marks are
| A). 310 |
| B). 325 |
| C). 350 |
| D). 360 |
|
27). Mathew scored 42 marks in Biology. 51 marks in Chemistry, 58 marks in Mathematics, 35 marks in Physics and 48 marks in English. The maximum marks, a student can score in each subject, are 60. How much overall percentage did Mathew get in this exam?
| A). 76% |
| B). 82% |
| C). 68% |
| D). 78% |
|
28). Reena got 76 marks in Hindi, 48 marks in Science, 84 .marks in Mathematics, 38 marks in Social Science and 72 marks in English. The maximum marks of each subject was 100. How much over all percentage of marks she got?
| A). 63.80% |
| B). 62.60% |
| C). 63.60% |
| D). 64.80% |
|
29). A box has 100 blue balls, 50 red balls and 50 black balls. 25% of blue balls and 50% of red balls are taken away. Then, percentage of black balls at present is
| A). 25% |
| B). \( \Large 33\frac{1}{3} \)% |
| C). 40% |
| D). 50% |
|
30). A jogger desires to run a certain course in \( \Large \frac{1}{4} \) less time than he usually takes. By what per cent must be increase his average running speed to accomplish the goal?
| A). 50% |
| B). 20% |
| C). 25% |
| D). \( \Large 33\frac{1}{3} \)% |
|
