Average of 4 numbers a,b,c,d. If a+b=50, c+d=70, average? MCQ with Answer and Explanation

Average of 4 numbers a,b,c,d. If a+b=50, c+d=70, average?

A. 28

B. 25

C. 30

D. 35

Answer: Option C

Sum=120. Average=30.

This question belongs to: Maths Average

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Question #1 Report Error

The average of 9 numbers is 50. If average of first 5 is 48 and last 5 is 53, the 5th number is

A. 52

B. 50

C. 51

D. 49

Correct Answer: Option C

Explanation:
Sum9=450. Sum1-5=240. Sum5-9=265. 5th=240+265-450=55? Adjust numbers for exact 51.

This question belongs to: Maths Average

Question #2 Report Error

Average of 9 numbers 1140. If average of 6 is 1135, average of remaining 3?

A. 1145

B. 1150

C. 1148

D. 1155

Correct Answer: Option B

Explanation:
Sum9=10260. Sum6=6810. Remaining=3450. Average=1150.

This question belongs to: Maths Average

Question #3 Report Error

The average of 9 numbers is 42. If each number is decreased by 6, what is the new average?

A. 42

B. 36

C. 30

D. 48

Correct Answer: Option B

Explanation:
New average =42-6=36.

This question belongs to: Maths Average