1 The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ? A) 0 B) 1 C) 10 D) 19
2 A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What should be the number in place of x ? A) 3 B) 7 C) 17 D) 31
3 The average of 7 consecutive numbers is 20. The largest of these numbers is : A) 20 B) 22 C) 23 D) 24
4 A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is : A) 250 B) 276 C) 280 D) 285
5 If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55 and 60, then the average marks of all the students is : A) 53.33 B) 54.68 C) 55 D) None of these
6 The average weight of 16 boys in a class is 50.25 kgs and that of the remaining 8 boys is 45.15 kgs. Find the average weight of all the boys in the class. A) 47.55 kgs B) 48kgs C) 48.55 kgs D) 49.25 kgs
7 The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then : A) x = y + z B) 2x = y + z C) x = 2y + 2z D) None of these
8 16 children are to be divided into two groups A and B of 10 and 6 children. The average percent marks obtained by the children pf group A is 75 and the average percent marks of all the 16 children is 76. What is the average percent marks of children of group B ? A) $77\frac{1}{3}$ B) $77\frac{2}{3}$ C) $78\frac{1}{3}$ D) $78\frac{2}{3}$
9 The average of six numbers is 3.95. The average of two of them is 3.4, while the average of the other two is 3.85. What is the average of the remaining two numbers ? A) 4.5 B) 4.6 C) 4.7 D) 4.8
10 The average price of 10 books is Rs. 12 while the average price of 8 of these books is Rs. 11.75. Of the remaining two books, if the price of one book is 60% more than the price of the other, what is the price of each of these two books ? A) Rs. 5, Rs. 7.50 B) Rs. 8, Rs. 12 C) Rs. 10, Rs. 16 D) Rs. 12, Rs. 14
11 A grocer has a sale of Rs. 6435, Rs. 6927, Rs. 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs. 6500 ? A) Rs. 4991 B) Rs. 5991 C) Rs. 6001 D) Rs. 6991
12 In the first 10 overs of a cricket game, the run rate was only 3.2. What should be the run rate in the remaining 40 overs to reach the target of 282 runs ? A) 6.25 B) 6.5 C) 6.75 D) 7
13 The average price of three items of furniture is Rs. 15000. If their prices are in the ratio 3:5:7, the price of the cheapest item is : A) Rs. 9000 B) Rs. 15000 C) Rs. 18000 D) Rs. 21000
14 Of the three numbers, the average of the first and the second is greater than the average of the second and the third by 15. What is the difference between the fire and the third of the three numbers ? A) 15 B) 45 C) 60 D) Data inadequate E) None of these
15 The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is : A) 1:2 B) 2:3 C) 3:4 D) 3:5
