If average of 15 numbers is 40 and average of 10 is 45, average of remaining 5? MCQ with Answer and Explanation

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If average of 15 numbers is 40 and average of 10 is 45, average of remaining 5?

A. 32

B. 35

C. 30

D. 25

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum15=600. Sum10=450. Remaining=150. Average=30.

This question belongs to: Maths Average

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Question #1

What is the average of all numbers from 1 to 30 that are divisible by 6?

A. 18

B. 18.5

C. 17.5

D. 17

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Correct Answer: Option A

Explanation:
Numbers:6,12,18,24,30 sum=90, count=5, avg=18.

This question belongs to: Maths Average

Question #2

Average of 9 numbers 690. If average of 6 is 685, average of remaining 3?

A. 705

B. 700

C. 695

D. 698

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Correct Answer: Option B

Explanation:
Sum9=6210. Sum6=4110. Remaining=2100. Average=700.

This question belongs to: Maths Average

Question #3

The average height of 4 boys is 1.5 m. If a girl of height 1.6 m joins, what is the new average?

A. 1.52 m

B. 1.55 m

C. 1.53 m

D. 1.5 m

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Correct Answer: Option A

Explanation:
Sum of 4 =4×1.5=6.0. Sum of 5=6.0+1.6=7.6. Average=7.6/5=1.52.

This question belongs to: Maths Average

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