The average of three numbers is 45. If two numbers are 40 and 50, the third number is: MCQ with Answer and Explanation

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The average of three numbers is 45. If two numbers are 40 and 50, the third number is:

A. 50

B. 55

C. 40

D. 45

Answer: Option D

Solution (By JKSSB Mock Tests)

Total of three numbers = 3×45 = 135. Third number = 135−40−50 = 45.

This question belongs to: Maths Average

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Question #1

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The average of 4 numbers is 21. If the average of first two numbers is 18, what is the average of the last two numbers?

A. 24

B. 23

C. 21.5

D. 22

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Correct Answer: Option A

Explanation:
Sum of all =4×21=84. Sum of first two =2×18=36. Sum of last two =84-36=48. Average of last two =48/2=24.

This question belongs to: Maths Average

Question #2

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The average of 7 numbers is 45. If each number is decreased by 3, what is the new average?

A. 42

B. 39

C. 45

D. 48

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Correct Answer: Option A

Explanation:
New average =45-3=42.

This question belongs to: Maths Average

Question #3

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The average of 8 numbers is 31. If each number is increased by 3, what is the new average?

A. 34

B. 37

C. 31

D. 28

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Correct Answer: Option A

Explanation:
New average =31+3=34.

This question belongs to: Maths Average

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