The average of some natural numbers is 15. If 30 is added to first num – McqOptions

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1.	The average of some natural numbers is 15. If 30 is added to first number and 5 is subtracted from the last number, the average become 17.5. then the numbers of natural numbers is :
A.	10
B.	20
C.	30
D.	15
Answer» B. 20

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