The average of 3 numbers is 18. If two of the numbers are 15 and 20, find the third number. MCQ with Answer and Explanation

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The average of 3 numbers is 18. If two of the numbers are 15 and 20, find the third number.

A. 18

B. 19

C. 17

D. 20

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum of 3 numbers = 3×18=54. Sum of two =15+20=35. Third =54-35=19.

This question belongs to: Maths Average

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Question #1

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The average of 20 and 40 is 30, average of 40 and 60 is 50, average of 20,40,60 is

A. 45

B. 38

C. 40

D. 42

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Correct Answer: Option C

Explanation:
Sum=120. Average=40.

This question belongs to: Maths Average

Question #2

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Average of 825,1100,1375 is

A. 1090

B. 1095

C. 1110

D. 1100

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Correct Answer: Option D

Explanation:
3300/3=1100.

This question belongs to: Maths Average

Question #3

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The average of 9 consecutive numbers is 27. Largest number?

A. 33

B. 31

C. 30

D. 32

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Correct Answer: Option B

Explanation:
Middle 5th=27. Largest=27+4=31.

This question belongs to: Maths Average

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