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 2, 7, 6 and x is 5 and the average of 18, 1, 6, x and y is 10. What is the value of y ? A) 5 B) 10 C) 20 D) 30
4 The average of the two-digit numbers, which remain the same when the digits interchange their positions, is : A) 33 B) 44 C) 55 D) 66
5 The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers ? A) 2 B) 5 C) 8 D) Cannot be determined E) None of these
6 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
7 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
8 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
9 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
10 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
11 The batting average for 40 innings of a cricket player is 50 runs. His highest score exceeds his lowest score by 172 runs. If these two innings are excluded, the average of the remaining 38 innings is 48 runs. The highest score of the player is : A) 165 runs B) 170 runs C) 172 runs D) 174 runs
12 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
13 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
14 After replacing an old member by a new member, it was found that the average age of five members of a'club is the safrie as it was 3 years ago. What is the difference between the ages of the replaced and the new member ? A) 2 years B) 4 years C) 8 years D) 15 years
15 A certain factory employed 600 men and 400 women and the average wage was Rs. 25.50 per day. If a woman got Rs. 5 less than a man, then what are their daily wages ? A) Man : Rs. 25; Woman : Rs. 20 B) Man • Rs. 27.50, Woman : Rs. 22.50 C) Man : Rs. 30, Woman : Rs. 25 D) Man : Rs. 32.50, Woman : Rs. 27.50