Average MCQs

Practice Average MCQs with answers and detailed explanations. Learn basic average concepts, average age, marks, salary, speed, combined average, weighted average and advanced aptitude questions designed for SSC, Railway, Banking, UPSC, JKSSB, Police, Teaching and other competitive exams.

965 Total

Question #31 Report Error

The average of 2 numbers is 15. If one number is 10, what is the other?

A. 5

B. 25

C. 15

D. 20

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Correct Answer: Option D

Explanation:
Sum =2×15=30. Other =30-10=20.

This question belongs to: Maths Average

Question #32 Report Error

What is the average of all odd numbers from 1 to 19?

A. 10

B. 9

C. 10.5

D. 9.5

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Correct Answer: Option A

Explanation:
Odd numbers: 1,3,5,...,19. There are 10 terms. Sum = n^2 =10^2=100. Average=100/10=10.

This question belongs to: Maths Average

Question #33 Report Error

The average of 7 numbers is 50. If each number is increased by 5, what is the new average?

A. 60

B. 55

C. 50

D. 45

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Correct Answer: Option B

Explanation:
New average =50+5=55.

This question belongs to: Maths Average

Question #34 Report Error

The average height of 5 students is 150 cm. If a new student of height 160 cm joins, what is the new average?

A. 152 cm

B. 151.67 cm

C. 155 cm

D. 151 cm

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Correct Answer: Option B

Explanation:
Sum of 5 =5×150=750. Sum of 6 =750+160=910. New average =910/6=151.67.

This question belongs to: Maths Average

Question #35 Report Error

Find the average of the first 10 even numbers.

A. 10

B. 11.5

C. 12

D. 11

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Correct Answer: Option D

Explanation:
Sum of first 10 even numbers = 10×11=110 (since sum = n(n+1) for first n evens? Actually sum = 2+4+...+20 = 2*(1+2+...+10)=2*55=110). Average=110/10=11.

This question belongs to: Maths Average