1 David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, Mathematics, Physics, Chemistry and Biology. What are his average marks ? A) 65 B) 69 C) 72 D) 76 E) None of these
2 In Aran's opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Aran and he thinks that Arum's weight is greater than 60 kg bat less than 70 kg. His mother's view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimation, what is the average of different probable weights of Aran ? A) 67 kg B) 68 kg C) 69 kg D) Data inadequate E) None of these
3 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
4 Find the average of all the numbers between 6 and 34 which are divisible by 5. A) 18 B) 20 C) 24 D) 30
5 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
6 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
8 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
9 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
10 A car owner buys petrol at Rs 7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year ? A) Rs. 7.98 B) Rs. 8 C) Rs. 8.50 D) Rs. 9
11 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
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 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
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 In a school with 600 students, the average age of the, boys is 12 years and that of the girls is 11 years.- If the average age of the school is 11 years 9 months, then the number of girls in the school is : A) 150 B) 250 C) 350 D) 450