Average of 15 numbers 2010. If average of 9 is 2005, average of remaining 6? MCQ with Answer and Explanation

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Average of 15 numbers 2010. If average of 9 is 2005, average of remaining 6?

A. 2018

B. 2020

C. 2015

D. 2017.5

Answer: Option D

Solution (By JKExamLibrary)

Sum15=30150. Sum9=18045. Remaining=12105. Average=2017.5.

This question belongs to: Maths Average

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Question #1

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

A. 4

B. 1

C. 2 or 0.5

D. 5

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Correct Answer: Option C

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

Average of 8 numbers 1750. If average of 5 is 1745, average of remaining 3?

A. 1757

B. 1760

C. 1758.33

D. 1755

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Correct Answer: Option C

Explanation:
Sum8=14000. Sum5=8725. Remaining=5275. Average≈1758.33.

This question belongs to: Maths Average

Question #3

The average of 330,440,550 is

A. 440

B. 435

C. 430

D. 450

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Correct Answer: Option A

Explanation:
1320/3=440.

This question belongs to: Maths Average

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