The average of 3 numbers is 28. If two numbers are 25 and 30, find the third. MCQ with Answer and Explanation

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The average of 3 numbers is 28. If two numbers are 25 and 30, find the third.

A. 29

B. 26

C. 27

D. 31

Answer: Option A

Solution (By JKExamLibrary)

Sum=3×28=84. Third =84-25-30=29.

This question belongs to: Maths Average

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Average of 1245,1660,2075 is

A. 1655

B. 1670

C. 1660

D. 1650

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Correct Answer: Option C

Explanation:
4980/3=1660.

This question belongs to: Maths Average

Question #2 Report Error

If the average of 5 numbers is 60 and the average of first two is 55, average of last two is 65, then the middle number is

A. 70

B. 60

C. 55

D. 65

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Correct Answer: Option B

Explanation:
Sum5=300. Sum first2=110. Sum last2=130. Middle=300-240=60.

This question belongs to: Maths Average

Question #3 Report Error

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. 41

B. 38

C. 40

D. 39

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Correct Answer: Option D

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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