Average of 10 numbers is 40. If each number is multiplied by 2, what is the new average? MCQ with Answer and Explanation

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Average of 10 numbers is 40. If each number is multiplied by 2, what is the new average?

A. 60

B. 40

C. 20

D. 80

Answer: Option D

Solution (By JKSSB Mock Tests)

If each number is multiplied by a constant, average is also multiplied by the same. New average = 40 × 2 = 80.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

Average of 10,15,20,25,30 is

A. 20

B. 18

C. 25

D. 22

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Correct Answer: Option A

Explanation:
100/5=20.

This question belongs to: Maths Average

Question #2

The average of 5 numbers is 42. If two numbers are 38 and 44, find the average of the remaining three.

A. 43

B. 42.67

C. 41.33

D. 42

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Correct Answer: Option B

Explanation:
Sum=5×42=210. Sum of two=38+44=82. Sum of three=128. Avg=128/3=42.67.

This question belongs to: Maths Average

Question #3

The average of 20 numbers is 45. Later it was found that 52 was wrongly taken as 25. What is the correct average?

A. 47

B. 45.35

C. 46.35

D. 46

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Correct Answer: Option C

Explanation:
Error = 52-25=27 too less. Correct sum = old sum +27. Old sum=20×45=900. New sum=927. Average=927/20=46.35.

This question belongs to: Maths Average

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