The average of some natural numbers is 15. If 30 is added to the first number an

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The average of some natural numbers is 15. If 30 is added to the first number and 5 is subtracted from the last number the average becomes 17.5 then the number of natural numbers is -

Options:

A . 20

B . 30

C . 15

D . 10

Answer: Option D

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