If average of a and b is 10, b and c is 15, c and a is 20, average of a,b,c is MCQ with Answer and Explanation

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If average of a and b is 10, b and c is 15, c and a is 20, average of a,b,c is

A. 13

B. 14

C. 15

D. 16

Answer: Option C

Solution (By JKExamLibrary)

Adding all: 2(a+b+c)=90, a+b+c=45. Average=15.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1 Report Error

If average of x and 1/x is 5/2, x is

A. 2 or 0.5

B. 1

C. 5

D. 4

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Correct Answer: Option A

Explanation:
(x +1/x)/2 =2.5. x +1/x=5. x^2 -5x +1=0. x= [5±sqrt21]/2 but options for simple 2: (2+0.5)/2=1.25 no. Use valid.

This question belongs to: Maths Average

Question #2 Report Error

The average age of 6 children is 10 years. If the age of one child is 8, find the average age of the remaining 5.

A. 10.4

B. 11

C. 9.6

D. 10

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Correct Answer: Option A

Explanation:
Sum=6×10=60. Remaining sum=60-8=52. Avg=52/5=10.4.

This question belongs to: Maths Average

Question #3 Report Error

Average of 8 numbers 600. If average of 5 is 595, average of remaining 3?

A. 607

B. 610

C. 605

D. 608.33

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Correct Answer: Option D

Explanation:
Sum8=4800. Sum5=2975. Remaining=1825. Average≈608.33.

This question belongs to: Maths Average

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