Average of 20 numbers 70. If 5 numbers average 80, average of remaining 15? MCQ with Answer and Explanation

Average of 20 numbers 70. If 5 numbers average 80, average of remaining 15?

A. 65

B. 68

C. 67

D. 66.67

Answer: Option D

Total=1400. 5=400. Remaining=1000/15≈66.67.

This question belongs to: Maths Average

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Question #1 Report Error

The average of 7 numbers is 30. If each number is divided by 2, what is the new average?

A. 15

B. 14

C. 13

D. 16

Correct Answer: Option A

Explanation:
New average =30/2=15.

This question belongs to: Maths Average

Question #2 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. 58 kg

B. 56 kg

C. 62 kg

D. 60 kg

Correct Answer: Option D

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 #3 Report Error

Average of 45,60,75,90 is

A. 65

B. 67.5

C. 70

D. 68

Correct Answer: Option B

Explanation:
270/4=67.5.

This question belongs to: Maths Average