The average of first 8 multiples of 5 is MCQ with Answer and Explanation

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The average of first 8 multiples of 5 is

A. 20

B. 22.5

C. 30

D. 25

Answer: Option B

Solution (By JKSSB Mock Tests)

5*(1+8)/2=22.5.

This question belongs to: Maths Average

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Question #1

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Average of 15 numbers 1810. If average of 9 is 1805, average of remaining 6?

A. 1820

B. 1817.5

C. 1818

D. 1815

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Correct Answer: Option B

Explanation:
Sum15=27150. Sum9=16245. Remaining=10905. Average=1817.5.

This question belongs to: Maths Average

Question #2

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Average of 8 numbers 1700. If average of 5 is 1695, average of remaining 3?

A. 1705

B. 1707

C. 1710

D. 1708.33

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Correct Answer: Option D

Explanation:
Sum8=13600. Sum5=8475. Remaining=5125. Average≈1708.33.

This question belongs to: Maths Average

Question #3

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The average marks of 12 students is 72. If a student with 88 marks leaves, what is the new average?

A. 70

B. 70.55

C. 71.5

D. 71

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Correct Answer: Option B

Explanation:
Sum=12×72=864. New sum=864-88=776. New avg=776/11=70.545≈70.55.

This question belongs to: Maths Average

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