Average of 50 and 60 is 55, average of 60 and 70 is 65, average of 50,60,70 is MCQ with Answer and Explanation

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Average of 50 and 60 is 55, average of 60 and 70 is 65, average of 50,60,70 is

A. 59

B. 58.33

C. 60

D. 61

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum=180. Average=60.

This question belongs to: Maths Average

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Question #1

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What is the average of the first 5 prime numbers?

A. 5.6

B. 6.0

C. 5.8

D. 5.4

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Correct Answer: Option A

Explanation:
Primes: 2,3,5,7,11 sum=28, avg=28/5=5.6.

This question belongs to: Maths Average

Question #2

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Average of 15 numbers 2210. If average of 9 is 2205, average of remaining 6?

A. 2217.5

B. 2218

C. 2215

D. 2220

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Correct Answer: Option A

Explanation:
Sum15=33150. Sum9=19845. Remaining=13305. Average=2217.5.

This question belongs to: Maths Average

Question #3

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The average marks of 12 students is 72. If one student scored 84 marks, what is the total marks of the remaining students?

A. 780

B. 744

C. 720

D. 768

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Correct Answer: Option A

Explanation:
Total marks = 12×72 = 864. Remaining students' marks = 864−84 = 780.

This question belongs to: Maths Average

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