If average of 5 numbers is 36 and average of 3 is 30, average of remaining 2? MCQ with Answer and Explanation

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If average of 5 numbers is 36 and average of 3 is 30, average of remaining 2?

A. 40

B. 45

C. 48

D. 42

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum5=180. Sum3=90. Remaining=90. Average=45.

This question belongs to: Maths Average

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Question #1

Average of 50 numbers is 38. The number 45 was wrongly written as 54. Correct average?

A. 37.82

B. 39

C. 38

D. 37.8

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Correct Answer: Option A

Explanation:
Error +9, decrease 9/50=0.18, correct average=38-0.18=37.82.

This question belongs to: Maths Average

Question #2

A batsman average 40 in 10 innings. To raise average to 42 in 11 innings, runs in 11th?

A. 62

B. 60

C. 58

D. 64

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Correct Answer: Option A

Explanation:
Total for 11=462. In 10=400. Required=62.

This question belongs to: Maths Average

Question #3

The average of 5 numbers is 28. If one number is excluded, the average becomes 25. What is the excluded number?

A. 35

B. 40

C. 45

D. 30

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Correct Answer: Option B

Explanation:
Sum of 5 numbers = 5 × 28 = 140. Sum of remaining 4 numbers = 4 × 25 = 100. Excluded number = 140 - 100 = 40.

This question belongs to: Maths Average

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