The average of 3 numbers is 12. If the first is 10 and the second is 15, find the third. MCQ with Answer and Explanation

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The average of 3 numbers is 12. If the first is 10 and the second is 15, find the third.

A. 9

B. 12

C. 11

D. 13

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum=3×12=36. Third=36-10-15=11.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

Average of 4 consecutive numbers is 49.5. Largest number?

A. 50

B. 51

C. 49

D. 52

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Correct Answer: Option B

Explanation:
Average middle of 2nd 3rd 49.5. Largest=49.5+1.5=51.

This question belongs to: Maths Average

Question #2

The average weight of 25 students is 50 kg. If the weight of teacher is included, average increases by 1 kg. What is teacher's weight?

A. 74

B. 76

C. 75

D. 80

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Correct Answer: Option B

Explanation:
Total students weight=1250. New total for 26=26×51=1326. Teacher=1326-1250=76 kg.

This question belongs to: Maths Average

Question #3

Average of 12 numbers 2270. If average of 8 is 2265, average of remaining 4?

A. 2282

B. 2278

C. 2275

D. 2280

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Correct Answer: Option D

Explanation:
Sum12=27240. Sum8=18120. Remaining=9120. Average=2280.

This question belongs to: Maths Average

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