Average of 9 numbers 45. If average of first 5 is 42, average of last 5 is 48, 5th number? MCQ with Answer and Explanation

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Average of 9 numbers 45. If average of first 5 is 42, average of last 5 is 48, 5th number?

A. 42

B. 48

C. 45

D. 46

Answer: Option C

Solution (By JKExamLibrary)

Sum9=405. Sum1-5=210. Sum5-9=240. 5th=210+240-405=45.

This question belongs to: Maths Average

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Average of 12 numbers 2170. If average of 8 is 2165, average of remaining 4?

A. 2180

B. 2175

C. 2178

D. 2182

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Correct Answer: Option A

Explanation:
Sum12=26040. Sum8=17320. Remaining=8720. Average=2180.

This question belongs to: Maths Average

Question #2 Report Error

The average marks of 18 students is 68. If a student with 82 marks joins, what is the new average?

A. 68.2

B. 68.5

C. 69.0

D. 68.74

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Correct Answer: Option D

Explanation:
Sum=18×68=1224. New sum=1224+82=1306. New avg=1306/19=68.74.

This question belongs to: Maths Average

Question #3 Report Error

Average of numbers divisible by 3 between 20 and 50.

A. 33

B. 36

C. 37

D. 35

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Correct Answer: Option B

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