the average marks in mathematics scored by the pupils of a school at the publi

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the average marks in mathematics scored by the pupils of a school at the public examination were 39. if four of these pupils who actually scored 5, 12, 15 and 19 marks at the examination had not been

Options:

A . 20

B . 25

C . 30

D . 32

Answer: Option B
Explanation :

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Question 7. the average age 9 members of a committee are the same as it was 2 years ago, because an old number has been replaced b....much younger is the new member than the old number?

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