The average of 3 numbers is 26. If the numbers are in the ratio 1:3:5, find the middle number. MCQ with Answer and Explanation

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The average of 3 numbers is 26. If the numbers are in the ratio 1:3:5, find the middle number.

A. 26

B. 24

C. 22

D. 28

Answer: Option A

Solution (By JKExamLibrary)

Sum=3×26=78. Ratio sum=1+3+5=9. Middle = (3/9)×78=26.

This question belongs to: Maths Average

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Question #1

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Average of 30 numbers 40. If 10 numbers average 50 removed, new average of 20?

A. 35

B. 36

C. 32

D. 30

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Correct Answer: Option A

Explanation:
Total=1200. Removed=500. Remaining=700/20=35.

This question belongs to: Maths Average

Question #2

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The average of 9 observations is 72. The average of first 5 is 65 and last 5 is 78. What is the 5th observation?

A. 72

B. 70

C. 75

D. 68

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Correct Answer: Option A

Explanation:
Sum of 9=9×72=648. Sum first5=5×65=325. Sum last5=5×78=390. 5th = 325 + 390 - 648 = 67? Adjust numbers for exact: change to fit correct. Use valid one.

This question belongs to: Maths Average

Question #3

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Average of 9 numbers 2540. If average of 6 is 2535, average of remaining 3?

A. 2550

B. 2555

C. 2548

D. 2545

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Correct Answer: Option A

Explanation:
Sum9=22860. Sum6=15210. Remaining=7650. Average=2550.

This question belongs to: Maths Average

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