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AveragesMathematics Teaching Exams

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Question1) 1.

Ajit has a certain average for 9 innings. In the tenth innings, he scores 100 runs thereby increasing his average by 8 runs. His new average is:

A.20

B.21

C.28

D.32

Option- ['A', 'B', 'C', 'D']

Explaination: C

Question2) 2.

The average temperature for Wednesday, Thursday and Friday was 40°C. The average for Thursday, Friday and Saturday was 41° C. If temperature on Saturday was 42° C, what was the temperature on Wednesday?

A.39° C

B.44° C

C.38° C

D.41° C

Option- ['A', 'B', 'C', 'D']

Explaination: A

Question3) 3.

The average of the first five multiples of 9 is:

A.20

B.27

C.28

D.30

Option- ['A', 'B', 'C', 'D']

Explaination: B

Question4) 4.

The speed of the train going from Nagpur to Allahabad is 100 km/h while when coming back from Allahabad to Nagpur, its speed is 150 km/h. find the average speed during whole journey.

A.125 km/hr

B.75 km/hr

C.135 km/hr

D.120 km/hr

Option- ['A', 'B', 'C', 'D']

Explaination: D

Question5) 5.

Find the average of first 97 natural numbers.

A.47

B.37

C.48

D.49

E.49.5

Option- ['A', 'B', 'C', 'D']

Explaination: D

Question6) 6.

The average age of three boys is 15 years. If their ages are in ratio 3 : 5 : 7, the age of the youngest boy is

A.21 years

B.18 years

C.15 years

D.9 years

E.12 years

Option- ['A', 'B', 'C', 'D']

Explaination: D

Question7) 7.

The average of a group of men is increased by 5 years when a person aged of 18 years is replaced by a new person of aged 38 years. How many men are there in the group?

A.3

B.4

C.5

D.6

E.7

Option- ['A', 'B', 'C', 'D']

Explaination: B

Question8) 8.

In a boat there are 8 men whose average weight is increased by 1 kg when 1 man of 60 kg is replaced by a new man. What is weight of new comer?

A.70 years

B.66 years

C.68 years

D.69 years

Option- ['A', 'B', 'C', 'D']