Averages

A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:

• 20

• 40

• 60

• 80

Answer explanation

If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:

• 53.68

• 54.68

• 55.68

• 56.68

Answer explanation

The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is:

• 23 kg

• 27 kg

• 29 kg

• 31 kg

Answer explanation

The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team?

• 21 years

• 22 years

• 23 years

• 24 years

Answer explanation

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:

• 30 years

• 40 years

• 50 years

• 60 years

Answer explanation

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?

• Rs.4991

• Rs.5991

• Rs.6991

• Rs.7991

Answer explanation

The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?

• 0

• 1

• 10

• 20

Answer explanation

The average weight of 8 people increases by 2.5 kg when a new person replaces one weighing 65 kg. What is the weight of the new person?

• 80 kg

• 83 kg

• 85 kg

• 88 kg

Answer explanation

A man travels a distance at 40 km/h and returns at 60 km/h. What is his average speed for the whole journey?

• 42 km/hr

• 44 km/hr

• 46 km/hr

• 48 km/hr

Answer explanation

The average weight of 8 wrestlers is 100 kg. A sumo wrestler joins, making the average 120 kg.
What’s the sumo wrestler’s weight?

• 220 kg

• 240 kg

• 260 kg

• 280 kg

Answer explanation