Average of 9 numbers 1290. If average of 6 is 1285, average of remaining 3? MCQ with Answer and Explanation

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Average of 9 numbers 1290. If average of 6 is 1285, average of remaining 3?

A. 1298

B. 1300

C. 1305

D. 1295

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum9=11610. Sum6=7710. Remaining=3900. Average=1300.

This question belongs to: Maths Average

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Question #1

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Average temperature for Monday to Wednesday was 40°C. Average for Tuesday to Thursday was 41°C. Thursday temperature was 42°C. What was Monday's temperature?

A. 38

B. 39

C. 41

D. 40

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Correct Answer: Option B

Explanation:
Let M,T,W,Th. (M+T+W)/3=40. (T+W+Th)/3=41, Th=42. From second: T+W=123-42=81. First: M+81=120, M=39.

This question belongs to: Maths Average

Question #2

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The average marks of 20 students is 75. If a student with 90 marks leaves, what is the new average?

A. 74.0

B. 74.21

C. 75.0

D. 73.5

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Correct Answer: Option B

Explanation:
Sum=20×75=1500. New sum=1500-90=1410. New average=1410/19=74.21.

This question belongs to: Maths Average

Question #3

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Average of 10 numbers 1380. If average of 6 is 1375, average of remaining 4?

A. 1385

B. 1386

C. 1387.5

D. 1390

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Correct Answer: Option C

Explanation:
Sum10=13800. Sum6=8250. Remaining=5550. Average=1387.5.

This question belongs to: Maths Average

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