The average of seven numbers is 18. If one of the number is 17 and if it is replaced by 31, then the average becomes :

The average of seven numbers is 18. If one of the number is 17 and if

1.	The average of seven numbers is 18. If one of the number is 17 and if it is replaced by 31, then the average becomes :
A.	21.5
B.	19.5
C.	20
D.	21
Answer» D. 21

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The average of seven numbers is 18. If one of the number is 17 and if it is replaced by 31, then the average becomes :

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