Average of 12 numbers 1220. If average of 8 is 1215, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 1220. If average of 8 is 1215, average of remaining 4?

A. 1225

B. 1228

C. 1230

D. 1232

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum12=14640. Sum8=9720. Remaining=4920. Average=1230.

This question belongs to: Maths Average

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Question #1

Average of 8 numbers 700. If average of 5 is 695, average of remaining 3?

A. 707

B. 705

C. 710

D. 708.33

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Correct Answer: Option D

Explanation:
Sum8=5600. Sum5=3475. Remaining=2125. Average≈708.33.

This question belongs to: Maths Average

Question #2

A man travels first half distance at 20 km/h, second at 30 km/h. Average speed?

A. 25 km/h

B. 22 km/h

C. 24 km/h

D. 26 km/h

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Correct Answer: Option C

Explanation:
2*20*30/(20+30)=1200/50=24 km/h.

This question belongs to: Maths Average

Question #3

The average age of 5 persons is 25 years. If one person aged 30 leaves, what is the average of the remaining?

A. 24.5

B. 23.5

C. 23.75

D. 24

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Correct Answer: Option C

Explanation:
Sum=5×25=125. New sum=125-30=95. Avg=95/4=23.75.

This question belongs to: Maths Average

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