Average of 12 numbers 670. If average of 8 is 665, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 670. If average of 8 is 665, average of remaining 4?

A. 680

B. 682

C. 675

D. 678

Answer: Option A

Solution (By JKExamLibrary)

Sum12=8040. Sum8=5320. Remaining=2720. Average=680.

This question belongs to: Maths Average

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Question #1 Report Error

Average speed for round trip at 40 km/h going and 60 km/h returning?

A. 55 km/h

B. 45 km/h

C. 50 km/h

D. 48 km/h

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Correct Answer: Option D

Explanation:
2*40*60/(40+60)=48 km/h.

This question belongs to: Maths Average

Question #2 Report Error

Average of 20 numbers 48. If two numbers 40 and 60 replaced by 50 and 70, new average?

A. 49

B. 48

C. 50

D. 47

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Correct Answer: Option A

Explanation:
Net +20, increase 1. New=49.

This question belongs to: Maths Average

Question #3 Report Error

The average marks of boys in a class is 60 and that of girls is 70. If there are 20 boys and 30 girls, the average marks of the whole class is:

A. 65

B. 64

C. 68

D. 66

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Correct Answer: Option D

Explanation:
Combined average = (20×60 + 30×70)/50 = 3300/50 = 66.

This question belongs to: Maths Average

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