Average of 12 numbers 1220. If average of 8 is 1215, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 1220. If average of 8 is 1215, average of remaining 4?

A. 1228

B. 1232

C. 1230

D. 1225

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum12=14640. Sum8=9720. Remaining=4920. Average=1230.

This question belongs to: Maths Average

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Question #1

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The average age of 6 students is 12 years. If the teacher's age is included, the average becomes 15 years. What is the teacher's age?

A. 27

B. 30

C. 33

D. 36

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Correct Answer: Option C

Explanation:
Sum of 6 students' ages = 6×12=72. Sum of 7 persons = 7×15=105. Teacher's age = 105-72=33.

This question belongs to: Maths Average

Question #2

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The average of 5 numbers is 30. If each number is multiplied by 1.2, what is the new average?

A. 30

B. 36

C. 24

D. 42

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Correct Answer: Option B

Explanation:
New average =30×1.2=36.

This question belongs to: Maths Average

Question #3

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Average of 20,40,60,80,100,120 is

A. 75

B. 60

C. 70

D. 80

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Correct Answer: Option C

Explanation:
420/6=70.

This question belongs to: Maths Average

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