If the average of a,b,c,d is 30 and average of a,b is 25, average of c,d is MCQ with Answer and Explanation

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If the average of a,b,c,d is 30 and average of a,b is 25, average of c,d is

A. 32

B. 28

C. 30

D. 35

Answer: Option D

Solution (By JKSSB Mock Tests)

a+b+c+d =120. a+b=50. c+d=70. Average c,d =35.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

What is the average of all even numbers from 2 to 30?

A. 16

B. 15

C. 16.5

D. 15.5

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Correct Answer: Option A

Explanation:
Even numbers: 2 to 30 inclusive. Number of terms = (30-2)/2+1=15. Sum = n/2*(first+last) =15/2*(2+30)=15/2*32=240. Average=240/15=16.

This question belongs to: Maths Average

Question #2

The average of 10 numbers is 35. If each number is increased by 5, what will be the new average?

A. 35

B. 40

C. 42

D. 38

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Correct Answer: Option B

Explanation:
When each number increases by 5, the average also increases by 5. New average = 35+5 = 40.

This question belongs to: Maths Average

Question #3

The average of first 5 even numbers is

A. 5

B. 6

C. 7

D. 8

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Correct Answer: Option B

Explanation:
2+4+6+8+10=30. Average=6.

This question belongs to: Maths Average

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