Average of 9 numbers 640. If average of 6 is 635, average of remaining 3? MCQ with Answer and Explanation

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Average of 9 numbers 640. If average of 6 is 635, average of remaining 3?

A. 650

B. 645

C. 648

D. 655

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum9=5760. Sum6=3810. Remaining=1950. Average=650.

This question belongs to: Maths Average

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Question #1

Average of 9 numbers 690. If average of 6 is 685, average of remaining 3?

A. 695

B. 698

C. 705

D. 700

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Correct Answer: Option D

Explanation:
Sum9=6210. Sum6=4110. Remaining=2100. Average=700.

This question belongs to: Maths Average

Question #2

Average of 8 numbers 1200. If average of 5 is 1195, average of remaining 3?

A. 1210

B. 1207

C. 1205

D. 1208.33

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Correct Answer: Option D

Explanation:
Sum8=9600. Sum5=5975. Remaining=3625. Average≈1208.33.

This question belongs to: Maths Average

Question #3

Average speed for 3 equal distances at 20,30,60 km/h?

A. 40

B. 33.33

C. 30 km/h

D. 36.67

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Correct Answer: Option C

Explanation:
3d / (d/20 +d/30 +d/60) =3 / (0.05+0.0333+0.0167) =3/0.1 =30.

This question belongs to: Maths Average

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