If the average of 5 numbers is 60 and the average of first two is 55, average of last two is 65, then the middle number is MCQ with Answer and Explanation

Question

If the average of 5 numbers is 60 and the average of first two is 55, average of last two is 65, then the middle number is

A. 60

B. 55

C. 70

D. 65

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum5=300. Sum first2=110. Sum last2=130. Middle=300-240=60.

This question belongs to: Maths Average

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Question #1

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Average of 10 numbers 1480. If average of 6 is 1475, average of remaining 4?

A. 1490

B. 1486

C. 1487.5

D. 1485

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Correct Answer: Option C

Explanation:
Sum10=14800. Sum6=8850. Remaining=5950. Average=1487.5.

This question belongs to: Maths Average

Question #2

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Average of 15 numbers 1160. If average of 9 is 1155, average of remaining 6?

A. 1165

B. 1167.5

C. 1170

D. 1168

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Correct Answer: Option B

Explanation:
Sum15=17400. Sum9=10395. Remaining=7005. Average=1167.5.

This question belongs to: Maths Average

Question #3

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The average of 1530,2040,2550 is

A. 2035

B. 2050

C. 2030

D. 2040

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Correct Answer: Option D

Explanation:
6120/3=2040.

This question belongs to: Maths Average

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