The average marks of boys in a class is 60 and that of girls is 70. If there are 20 boys and 30 girls, the average marks of the whole class is: MCQ with Answer and Explanation

Question

The average marks of boys in a class is 60 and that of girls is 70. If there are 20 boys and 30 girls, the average marks of the whole class is:

A. 64

B. 66

C. 65

D. 68

Answer: Option B

Solution (By JKSSB Mock Tests)

Combined average = (20×60 + 30×70)/50 = 3300/50 = 66.

This question belongs to: Maths Average

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Question #1

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The average of 480,640,800 is

A. 630

B. 650

C. 640

D. 635

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Correct Answer: Option C

Explanation:
1920/3=640.

This question belongs to: Maths Average

Question #2

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The average height of 5 students is 150 cm. If a new student of height 160 cm joins, what is the new average?

A. 151.67 cm

B. 152 cm

C. 151 cm

D. 155 cm

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Correct Answer: Option A

Explanation:
Sum of 5 =5×150=750. Sum of 6 =750+160=910. New average =910/6=151.67.

This question belongs to: Maths Average

Question #3

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The average marks of 15 students is 80. If a student with 95 marks leaves, what is the new average?

A. 78.5

B. 79.5

C. 78.93

D. 79

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Correct Answer: Option C

Explanation:
Sum=15×80=1200. New sum=1200-95=1105. New avg=1105/14=78.93.

This question belongs to: Maths Average

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