The average of 7 numbers is 45. If each number is decreased by 3, what is the new average? MCQ with Answer and Explanation

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The average of 7 numbers is 45. If each number is decreased by 3, what is the new average?

A. 48

B. 39

C. 45

D. 42

Answer: Option D

Solution (By JKSSB Mock Tests)

New average =45-3=42.

This question belongs to: Maths Average

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Question #1

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The average score of a batsman in 11 innings is 48 runs. If his score in the next innings is 70, what becomes his new average?

A. 52

B. 51

C. 49.83

D. 50

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Correct Answer: Option C

Explanation:
Total runs in 11 innings = 11×48 = 528. New total = 528+70 = 598. Average = 598/12 = 49.83.

This question belongs to: Maths Average

Question #2

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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. 30

B. 36

C. 33

D. 27

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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 #3

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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. 24

C. 36

D. 42

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Correct Answer: Option C

Explanation:
New average =30×1.2=36.

This question belongs to: Maths Average

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