Average of 20 numbers 90. If average of 12 is 85, average of remaining 8? MCQ with Answer and Explanation

Average of 20 numbers 90. If average of 12 is 85, average of remaining 8?

A. 95

B. 97.5

C. 100

D. 96

Answer: Option B

Sum20=1800. Sum12=1020. Remaining=780. Average=97.5.

This question belongs to: Maths Average

No comments yet. Be the first to start the discussion!

Question #1 Report Error

The average weight of 8 students is 42 kg. If a new student joins, the average becomes 44 kg. What is the weight of the new student?

A. 56 kg

B. 60 kg

C. 58 kg

D. 62 kg

Correct Answer: Option B

Explanation:
Sum of 8 =8×42=336. Sum of 9 =9×44=396. New student's weight =396-336=60.

This question belongs to: Maths Average

Question #2 Report Error

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. 65.5

C. 66.0

D. 65.45

Correct Answer: Option D

Explanation:
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

Question #3 Report Error

The average of 32,48,64 is

A. 50

B. 45

C. 46

D. 48

Correct Answer: Option D

Explanation:
144/3=48.

This question belongs to: Maths Average