If average of x and y is 25 and average of y and z is 35, average of x,y,z? MCQ with Answer and Explanation

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If average of x and y is 25 and average of y and z is 35, average of x,y,z?

A. 30

B. 28.33

C. 32

D. 27

Answer: Option B

Solution (By JKSSB Mock Tests)

x+y=50. y+z=70. Sum x+y+z=120 - y. Need y. Not direct. Use different.

This question belongs to: Maths Average

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Question #1

Average of 9 numbers 2640. If average of 6 is 2635, average of remaining 3?

A. 2650

B. 2648

C. 2645

D. 2655

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Correct Answer: Option A

Explanation:
Sum9=23760. Sum6=15810. Remaining=7950. Average=2650.

This question belongs to: Maths Average

Question #2

Average of 9 numbers 790. If average of 6 is 785, average of remaining 3?

A. 798

B. 800

C. 805

D. 795

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Correct Answer: Option B

Explanation:
Sum9=7110. Sum6=4710. Remaining=2400. Average=800.

This question belongs to: Maths Average

Question #3

The average of first 15 multiples of 3 is

A. 27

B. 24

C. 25

D. 22.5

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Correct Answer: Option B

Explanation:
3*(1+15)/2 =3*8=24.

This question belongs to: Maths Average

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