Average of 5 numbers is 30. If average of first 3 is 28, average of last 3 is 32, then the 3rd number is MCQ with Answer and Explanation

Average of 5 numbers is 30. If average of first 3 is 28, average of last 3 is 32, then the 3rd number is

A. 30

B. 28

C. 32

D. 31

Answer: Option A

Sum5=150. Sum1-3=84. Sum3-5=96. 3rd =84 +96 -150=30.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 12 numbers 50. If average of 7 is 45, average of remaining 5?

A. 60

B. 57

C. 55

D. 58

Correct Answer: Option B

Explanation:
Sum12=600. Sum7=315. Remaining=285. Average=57.

This question belongs to: Maths Average

Question #2 Report Error

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

A. 23

B. 25

C. 26

D. 24

Correct Answer: Option B

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

This question belongs to: Maths Average

Question #3 Report Error

The average of 4 numbers is 21. If the average of first two numbers is 18, what is the average of the last two numbers?

A. 24

B. 22

C. 21.5

D. 23

Correct Answer: Option A

Explanation:
Sum of all =4×21=84. Sum of first two =2×18=36. Sum of last two =84-36=48. Average of last two =48/2=24.

This question belongs to: Maths Average