If average of a and b is 10, b and c is 15, c and a is 20, average of a,b,c is MCQ with Answer and Explanation

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If average of a and b is 10, b and c is 15, c and a is 20, average of a,b,c is

A. 16

B. 13

C. 15

D. 14

Answer: Option C

Solution (By JKSSB Mock Tests)

Adding all: 2(a+b+c)=90, a+b+c=45. Average=15.

This question belongs to: Maths Average

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Question #1

Average of 10 numbers 730. If average of 6 is 725, average of remaining 4?

A. 735

B. 740

C. 736

D. 737.5

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Correct Answer: Option D

Explanation:
Sum10=7300. Sum6=4350. Remaining=2950. Average=737.5.

This question belongs to: Maths Average

Question #2

Average of 15 numbers 2110. If average of 9 is 2105, average of remaining 6?

A. 2120

B. 2115

C. 2118

D. 2117.5

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Correct Answer: Option D

Explanation:
Sum15=31650. Sum9=18945. Remaining=12705. Average=2117.5.

This question belongs to: Maths Average

Question #3

The average of 6 numbers is 25. If each number is increased by 8, what is the new average?

A. 41

B. 17

C. 25

D. 33

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Correct Answer: Option D

Explanation:
New average =25+8=33.

This question belongs to: Maths Average

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