The average marks of 22 students is 65. If a student with 75 marks leaves and another with 85 joins, what is the new average? MCQ with Answer and Explanation

Question

The average marks of 22 students is 65. If a student with 75 marks leaves and another with 85 joins, what is the new average?

A. 65.2

B. 66.0

C. 65.45

D. 65.5

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum=22×65=1430. Remove 75: 1430-75=1355. Add 85: 1355+85=1440. New avg=1440/22=65.45.

This question belongs to: Maths Average

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Question #1

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Average of 8 numbers 2200. If average of 5 is 2195, average of remaining 3?

A. 2205

B. 2208.33

C. 2207

D. 2210

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Correct Answer: Option B

Explanation:
Sum8=17600. Sum5=10975. Remaining=6625. Average≈2208.33.

This question belongs to: Maths Average

Question #2

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Find the average of the first 5 multiples of 7.

A. 21

B. 19.5

C. 20

D. 22

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Correct Answer: Option A

Explanation:
Multiples:7,14,21,28,35 sum=105, count=5, avg=21.

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Question #3

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Average of 12 numbers 1120. If average of 8 is 1115, average of remaining 4?

A. 1125

B. 1132

C. 1130

D. 1128

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Correct Answer: Option C

Explanation:
Sum12=13440. Sum8=8920. Remaining=4520. Average=1130.

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