AVERAGE
CLASS WORK
(1) The average age of 25 students and the principal is 16 years. When the
principal’s age is excluded, the average age decreases by 2 year. What is
the age of the principal?
(a) 63 years
(b) 68 years
(c) 66 years
(d) 69 years
(2) 4 years ago, the average age of A, B and C was 30 years and that of B
and C 5 years ago was 20 years. A’s present age is
(a) 52 years
(b) 54 years
(c) 50 years
(d) 58 years
(3) The age of Vimal and Pavan is in the ratio 4 : 6. After 6 years, the ratio of
their ages will become 6: 8. Find the average of their ages after 10 years.
(a) 25
(b) 21
(c)23
(d)20
(4) The average age of a family of 6 members is 24 years. If the age of the
youngest member is 8 years, what was the average age of the family at the
birth of the youngest member?
(a)19.2
(b) 21.2
(c)17.2
(d)23.2
www.o2breathingbrains.com
(5) The average monthly expenditure of a family was ₹ 2850 for the first 3
months, ₹ 3150 for the next 3 months and ₹ 6850 for the next 3 months.
Find the average income of the family for the 9 months, if they save ₹ 650
per month.
(a)₹5933.33
(b) ₹4283.33
(c)₹5033.33
(d)₹4933.33
(6) Kartik has a certain average for 9 innings. In the tenth inning, he scored
110 runs thereby increasing his average by 9 runs. His new average is
(a)26
(b) 27
(c)29
(d)30
(7) The average score of a cricketer in 4 matches is 25 runs and in 3 other
matches; it is 18 runs. Find the average in all the 7 matches.
(a)20
(b) 22
(c)24
(d)26
(8) The average of the first 7 multiples of 9 is
(a)34
(b) 36
(c)38
(d)45
(9) The speed of the train going from Ayodhya to Surat is 120 km/hr while
when coming back from Surat to Ayodhya, its speed is 180 km/hr. find the
average speed during the whole journey.
(a)146 km/hr
(b) 138 km/hr
(c)150 km/hr
(d)144 km/hr
www.o2breathingbrains.com
(10) In a family of 9 males and a few ladies, the average monthly
consumption of grain per head is 10.8 kg. If the average monthly
consumption per head is 18 kg in the case of males and 9 kg in the case of
females, find the number of females in the family.
(a)36
(b) 33
(c)37
(d)38
(11) In a hotel where rooms are numbered from 101 to 130, each room gives
earnings of ₹ 4000 for the first 15 days of a month and for the latter half, ₹
3000 per room. Find the average earning per room per day over the month.
(Assume 30 day month)
(a)₹4000
(b)₹3800
(c)₹3500
(d) ₹3600
(12) The average temperature of 1st, 2nd, and 3rd July was 25.4 °C. The
average temperature for the first two days was 28°C. The temperature on
the 3rd of July was
(a) 20.2°C
(b) 21.2°C
(c) 18.2°C
(d)23.2°C
(13) The average of 15 papers is 42. The average of the first 8 papers is 48
and of the last 8 papers is 40. Find the marks obtained in the 8th paper.
(a)68
(b) 70
(c)74
(d)76
www.o2breathingbrains.com
(14) In a bag, there are 160 coins of ₹ 1, 50 paise and 25 paise
denominations. If the total value of coins is ₹ 160, then find how many
rupees can be constituted by 50 paise coins.
(a)0
(b) 2
(c)10
(d)20
(15) A man covers half of his journey by train at 80 km/h; half of the
remainder by bus at 30 km/h and the rest by cycle at 15 km/h. find his
average speed during the entire journey.
(a) 30 km/hr
(b) 32 km/hr
(c)36 km/hr
(d)34 km/hr
(16) A train travels 9 km in the first quarter of an hour, 8 km in the second
quarter and 40 km in the third quarter. Find the average speed of the train
per hour over the entire journey.
(a)78 km/hr
(b) 74 km/hr
(c)80 km/hr
(d)76 km/hr
(17) There are 5 boxes in a cargo hold. The weight of the first box is 250 kg
and the weight of the second box is 20 % higher than the weight of the
third box, whose weight is 25 % higher than the first box’s weight. The
fourth box at 350 kg is 30 % lighter than the fifth box. Find the difference in
the average weight of the four heaviest boxes and the four lightest boxes.
(a)67.5 kg
(b) 62.5 kg
(c)57.5 kg
(d)72.5 kg
www.o2breathingbrains.com
(18) 20 people went to a hotel for a combined dinner party. 13 of them spent
₹ 80 each on their dinner and the rest spent ₹ 5 more than the average
expenditure of all the 20. What was the total money spent by them?
(a)₹1653.85
(b) ₹1663.85
(c)₹1603.85
(d)₹1673.85
(19) Let p, q and r be three positive numbers such that p > q > r. The average
of the smallest number, the difference between the remaining two
numbers and the sum of the two greatest numbers is 24 more than the
average of all the three original numbers. What is the difference between p
and q?
(a) 8
(b) 24
(c) 48
(d) 72
(20) Find the average of the first 98 natural numbers.
(a)48.5
(b) 47.5
(c)49.5
(d)50.5
www.o2breathingbrains.com
