21). Average of a, b and c is 11; average of c, d and e is 17; average of e and f is 22 and average of e and c is 17 Find out the average of a, b, c, d, e and f
| A). \( 15\large\frac{2}{3} \) |
| B). \(18\large\frac{1}{2} \) |
| C). \( 21\large\frac{1}{3} \) |
| D). \(16\large\frac{1}{2} \) |
|
22). The average of a man and his two twin sons born on the same day is 30 yr. The ratio of the ages of father and one son is 5 : 2, what is the father's age?
| A). 50 yr |
| B). 30 yr |
| C). 45 yr |
| D). 20 yr |
|
23). If the average of the ages of Rakesh and Mohan is 15, average of the ages of Mohan and Ramesh is 12 and the average of the ages of Rakesh and Ramesh is 13, then the age of Mohan, is
| A). 16 |
| B). 13 |
| C). 14 |
| D). 12 |
|
24). A cricketer has a certain average for 10 innings. In the eleventh innings, he scored 216 runs, there by increasing his average by 12 runs. Find out his new average.
| A). 96 |
| B). 84 |
| C). 97 |
| D). 87 |
|
25). Nine friends have dinner in a hotel. Eight of them spent Rs 12 each on their meals and the ninth spent Rs. 16 more than the average expenditure of all the nine. Find out the total money spent by them.
| A). Rs. 126 |
| B). Rs. 135 |
| C). Rs. 111 |
| D). Rs. 141 |
|
26). The average weight of the students in four sections A, B, C and D is 60kg. The average weight of the students in A, B, C and D individually are 45 Kg, 50 Kg, 72 Kg and 80 Kg respectively. If the average weight of the students of section A and B together is 48 Kg and that of B and C together is 60 Kg, what is the ratio of the number of students in sections A and D?
| A). 12 : 7 |
| B). 4 : 3 |
| C). 3 : 2 |
| D). 8 : 5 |
|
27). The average age of students of a class is 15.8 yr. The average age of boys in the class is 16.4 yr and that of the girls is 15.4 year. Find out the ratio of the number of boys to the number of girls in the class
| A). 3 : 1 |
| B). 5 : 2 |
| C). 2 : 3 |
| D). 3 : 7 |
|
28). In a certain examination, the average marks of an examinee is 64 per paper. If he had obtained 18 more marks for his mathematics paper and 4 more marks for his English paper, his average per paper would have been 66. How many papers were there in the examination?
| A). 11 |
| B). 13 |
| C). 9 |
| D). 15 |
|
29). The average of all odd numbers upto 100 is
| A). 51 |
| B). 50 |
| C). 49.5 |
| D). 49 |
|
30). The average of 7 consecutive numbers is 103. The largest of these numbers is
| A). 106 |
| B). 105 |
| C). 104 |
| D). 107 |
|
