Average of 40 numbers 55. If 10 numbers average 65, average of remaining 30? MCQ with Answer and Explanation

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Average of 40 numbers 55. If 10 numbers average 65, average of remaining 30?

A. 52

B. 51.67

C. 50

D. 53

Answer: Option B

Solution (By JKExamLibrary)

Total=2200. 10=650. Remaining=1550/30≈51.67.

This question belongs to: Maths Average

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Question #1

Average of 5 numbers 48. If average of 2 is 40, average of remaining 3?

A. 52

B. 53.33

C. 50

D. 55

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Correct Answer: Option B

Explanation:
Sum5=240. Sum2=80. Remaining=160. Average≈53.33.

This question belongs to: Maths Average

Question #2

Average of 10 numbers 1680. If average of 6 is 1675, average of remaining 4?

A. 1690

B. 1685

C. 1686

D. 1687.5

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Correct Answer: Option D

Explanation:
Sum10=16800. Sum6=10050. Remaining=6750. Average=1687.5.

This question belongs to: Maths Average

Question #3

Average temperature for Monday to Wednesday was 40°C. Average for Tuesday to Thursday was 41°C. Thursday temperature was 42°C. What was Monday's temperature?

A. 38

B. 41

C. 39

D. 40

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Correct Answer: Option C

Explanation:
Let M,T,W,Th. (M+T+W)/3=40. (T+W+Th)/3=41, Th=42. From second: T+W=123-42=81. First: M+81=120, M=39.

This question belongs to: Maths Average

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