Average of 12 numbers is 40. If average of first 7 is 38, what is average of last 5? MCQ with Answer and Explanation

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Average of 12 numbers is 40. If average of first 7 is 38, what is average of last 5?

A. 40

B. 42

C. 43

D. 44

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum12=480. Sum first7=266. Sum last5=214. Average last5=42.8 ≈ but use exact numbers.

This question belongs to: Maths Average

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Question #1

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The average age of a family of 5 members is 30 years. The youngest member is 5 years old. What is the average age of the remaining 4 members?

A. 37.5

B. 36.25

C. 35

D. 34

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Correct Answer: Option B

Explanation:
Sum of ages = 5×30=150. Sum of remaining 4 =150-5=145. Average =145/4=36.25.

This question belongs to: Maths Average

Question #2

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The average of 10, 20, 30 is 20, average of 30,40,50 is 40, average of 10,20,30,40,50 is

A. 30

B. 32

C. 35

D. 28

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Correct Answer: Option A

Explanation:
Sum=150. Average=30.

This question belongs to: Maths Average

Question #3

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The average of 10 consecutive even numbers is 41. Largest?

A. 46

B. 50

C. 48

D. 52

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Correct Answer: Option B

Explanation:
Largest=41+9=50.

This question belongs to: Maths Average

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