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

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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. 82.5

C. 81.67

D. 81.33

Answer: Option C

Solution (By JKSSB Mock Tests)

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

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Question #1

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Average of 15 numbers 1610. If average of 9 is 1605, average of remaining 6?

A. 1618

B. 1617.5

C. 1615

D. 1620

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Correct Answer: Option B

Explanation:
Sum15=24150. Sum9=14445. Remaining=9705. Average=1617.5.

This question belongs to: Maths Average

Question #2

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Average of 8 numbers 1850. If average of 5 is 1845, average of remaining 3?

A. 1860

B. 1857

C. 1855

D. 1858.33

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Correct Answer: Option D

Explanation:
Sum8=14800. Sum5=9225. Remaining=5575. Average≈1858.33.

This question belongs to: Maths Average

Question #3

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The average weight of 10 students is 45 kg. If a new student joins, the average becomes 46 kg. What is the weight of the new student?

A. 56 kg

B. 57 kg

C. 55 kg

D. 54 kg

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Correct Answer: Option A

Explanation:
Total weight of 10 = 450. Total of 11 = 11×46=506. New student's weight = 506-450=56.

This question belongs to: Maths Average

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