Average of 12 numbers 1020. If average of 8 is 1015, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 1020. If average of 8 is 1015, average of remaining 4?

A. 1032

B. 1028

C. 1030

D. 1025

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum12=12240. Sum8=8120. Remaining=4120. Average=1030.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

Average speed to cover a distance in two equal parts at speeds x and y is

A. 2xy/(x+y)

B. x+y

C. (x+y)/2

D. xy/(x+y)

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Correct Answer: Option A

Explanation:
Harmonic mean for equal distances.

This question belongs to: Maths Average

Question #2

Average of 5 numbers is 30. If average of first 3 is 28, average of last 3 is 32, then the 3rd number is

A. 30

B. 31

C. 32

D. 28

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Correct Answer: Option A

Explanation:
Sum5=150. Sum1-3=84. Sum3-5=96. 3rd =84 +96 -150=30.

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. 1.53 m

B. 1.5 m

C. 1.55 m

D. 1.52 m

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Correct Answer: Option D

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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