The average of 7 numbers is 20. If average of first 4 is 18, last 3 is 23, what is average of 4th and 5th? MCQ with Answer and Explanation

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The average of 7 numbers is 20. If average of first 4 is 18, last 3 is 23, what is average of 4th and 5th?

A. 20

B. 22

C. 19

D. 21

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum7=140. Sum1-4=72. Sum5-7=69. Sum4+5 =140 - (sum1-3 +sum6-7). Use other. Adjust.

This question belongs to: Maths Average

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Question #1

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Average of 8 numbers 2650. If average of 5 is 2645, average of remaining 3?

A. 2655

B. 2657

C. 2660

D. 2658.33

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Correct Answer: Option D

Explanation:
Sum8=21200. Sum5=13225. Remaining=7975. Average≈2658.33.

This question belongs to: Maths Average

Question #2

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Average of 9,27,45 is

A. 28

B. 25

C. 27

D. 30

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Correct Answer: Option C

Explanation:
Sum=81. Average=27.

This question belongs to: Maths Average

Question #3

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Average of 885,1180,1475 is

A. 1170

B. 1175

C. 1180

D. 1190

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Correct Answer: Option C

Explanation:
3540/3=1180.

This question belongs to: Maths Average

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