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? MCQ with Answer and Explanation

Question

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. 36.25

B. 37.5

C. 34

D. 35

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Average

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Question #1

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Average of 5 numbers 22. If average of 3 is 20, average of remaining 2?

A. 26

B. 23

C. 25

D. 24

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Correct Answer: Option C

Explanation:
Sum5=110. Sum3=60. Remaining=50. Average=25.

This question belongs to: Maths Average

Question #2

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Average of 9 numbers 440. If average of 6 is 435, average of remaining 3?

A. 448

B. 450

C. 455

D. 445

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Correct Answer: Option B

Explanation:
Sum9=3960. Sum6=2610. Remaining=1350. Average=450.

This question belongs to: Maths Average

Question #3

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The average age of 12 students is 20 years. If the age of the teacher is included, the average increases by 1 year. What is the age of the teacher?

A. 32

B. 31

C. 33

D. 34

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Correct Answer: Option C

Explanation:
Total age of students = 12 × 20 = 240. New average = 21. Total age of 13 people = 13 × 21 = 273. Teacher's age = 273 - 240 = 33 years.

This question belongs to: Maths Average

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