Q. The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
1) 0
2) 1
3) 10
4) 19
Q. The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?
1) 76 kg
2) 76.5 kg
3) 85 kg
4) Data inadequate
Q. The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is:
1) 35 years
2) 40 years
3) 50 years
4) None of these
Q. 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?
1) Rs. 7.98
2) Rs. 8
3) Rs. 8.50
4) Rs. 9
Q. In an exam, the average was found to be 50 marks. After detecting computer errors, the marks of 100 candidates had to be changed from 90 to 60 each and the average came down to 45. The total number of candidates who took the exam was
1) 600
2) 700
3) 500
4) 400
Q. Out of four numbers, the average of the first three is 16 and that of the last three is 15. If the last number is 18, the first number is
1) 20
2) 21
3) 23
4) 25
Q. The average age of a group of 15 persons is 29 years. Among them, the age of each of the two persons is 55 years. The average age of the remaining 13 persons is
1) 29 years
2) 27 years
3) 26 years
4) 25 years
Q. The average of five consecutive even numbers starting with 14 is
1) 14
2) 16
3) 12
4) 18
Q. The average age of P, Q, R, S, and T five years ago was 45 years. By including Aditya percent age of all six are 49 years. The present age of Aditya is
1) 65
2) 69
3) 79
4) 89
Q. The average age of 40 numbers is 40. If two numbers 35 and 45 are discarded the average of the remaining set of number is
1) Average increase by 5
2) decrease by 4
3) not change
4) cannot determine
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