Average of 20 numbers 60. If each is halved, new average? MCQ with Answer and Explanation

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Average of 20 numbers 60. If each is halved, new average?

A. 120

B. 30

C. 15

D. 60

Answer: Option B

Solution (By JKSSB Mock Tests)

30.

This question belongs to: Maths Average

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Question #1

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The average monthly income of a person for 12 months is ₹30,000. If he earned ₹36,000 in one month, the average income for the remaining 11 months is:

A. ₹30,000

B. ₹29,454.55

C. ₹29,000

D. ₹31,000

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Correct Answer: Option B

Explanation:
Total income = 12×30000 = 360000. Remaining income = 360000−36000 = 324000. Average = 324000/11 = 29454.55.

This question belongs to: Maths Average

Question #2

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Average of first 10 odd numbers is

A. 12

B. 11

C. 10

D. 9

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Correct Answer: Option C

Explanation:
Average =10.

This question belongs to: Maths Average

Question #3

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The average of 3 numbers is 26. If the numbers are in the ratio 1:3:5, find the middle number.

A. 24

B. 22

C. 26

D. 28

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Correct Answer: Option C

Explanation:
Sum=3×26=78. Ratio sum=1+3+5=9. Middle = (3/9)×78=26.

This question belongs to: Maths Average

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