In a class of 40 students, average marks in Maths is 65. If average of 10 students is 80, what is average of remaining? MCQ with Answer and Explanation

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In a class of 40 students, average marks in Maths is 65. If average of 10 students is 80, what is average of remaining?

A. 55

B. 60

C. 58

D. 62

Answer: Option B

Solution (By JKSSB Mock Tests)

Total marks = 40×65=2600. Marks of 10=10×80=800. Remaining marks=1800. Average=1800/30=60.

This question belongs to: Maths Average

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Question #1

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The average marks of a student in 5 subjects is 80. If he scores 90 in the sixth subject, what is his new average?

A. 80.5

B. 81.67

C. 82.5

D. 81.33

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Correct Answer: Option B

Explanation:
Sum of 5 =5×80=400. Sum of 6 =400+90=490. New average =490/6=81.666... ≈81.67.

This question belongs to: Maths Average

Question #2

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Average of 12,24,36,48,60,72 is

A. 42

B. 45

C. 40

D. 36

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Correct Answer: Option A

Explanation:
Sum=252. Average=42.

This question belongs to: Maths Average

Question #3

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The average of first 10 prime numbers is

A. 13

B. 12

C. 15

D. 12.9

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Correct Answer: Option D

Explanation:
Sum=129. Average=12.9.

This question belongs to: Maths Average

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