Average of 25 results is 18. Average of first 12 is 14 and last 12 is 20. What is the 13th result? MCQ with Answer and Explanation

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Average of 25 results is 18. Average of first 12 is 14 and last 12 is 20. What is the 13th result?

A. 25

B. 26

C. 24

D. 22

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum25=450. Sum first12=168. Sum last12=240. 13th=450-408=42? Adjust values to match.

This question belongs to: Maths Average

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Question #1

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The average marks of 25 students is 72. If a student with 60 marks leaves, what is the new average?

A. 72.5

B. 71.5

C. 72

D. 73

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Correct Answer: Option A

Explanation:
Sum=25×72=1800. New sum=1800-60=1740. New avg=1740/24=72.5.

This question belongs to: Maths Average

Question #2

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Find the average of the squares of first 4 natural numbers.

A. 7

B. 6.5

C. 8

D. 7.5

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Correct Answer: Option D

Explanation:
Squares:1,4,9,16 sum=30, avg=30/4=7.5.

This question belongs to: Maths Average

Question #3

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Average of 10 numbers 530. If average of 6 is 525, average of remaining 4?

A. 540

B. 537.5

C. 535

D. 536

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Correct Answer: Option B

Explanation:
Sum10=5300. Sum6=3150. Remaining=2150. Average=537.5.

This question belongs to: Maths Average

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