Average of 4 numbers a,b,c,d is 20. If a=15, b=25, average of c,d? MCQ with Answer and Explanation

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Average of 4 numbers a,b,c,d is 20. If a=15, b=25, average of c,d?

A. 25

B. 22.5

C. 18

D. 20

Answer: Option D

Solution (By JKSSB Mock Tests)

c+d=80 -40=40. Average=20.

This question belongs to: Maths Average

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Question #1

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Average of 30,45,60,75 is

A. 50

B. 55

C. 52.5

D. 45

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Correct Answer: Option C

Explanation:
210/4=52.5.

This question belongs to: Maths Average

Question #2

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Average marks of boys 60, girls 70, total average 65. Ratio boys:girls?

A. 1:2

B. 1:1

C. 2:1

D. 3:1

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Correct Answer: Option B

Explanation:
Let b,g. 60b +70g =65(b+g). 5g=5b. b=g.

This question belongs to: Maths Average

Question #3

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Average of 50 numbers 40. If two numbers 30 and 50 are replaced by 40 and 60, new average?

A. 39

B. 40.4

C. 40

D. 41

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Correct Answer: Option B

Explanation:
Net change +20, increase 20/50=0.4, new 40.4.

This question belongs to: Maths Average

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