The average of first three numbers is three times of the fourth number. If the average of all four numbers is 5, then find the fourth number.

The average of first three numbers is three times of the fourth number

1.	The average of first three numbers is three times of the fourth number. If the average of all four numbers is 5, then find the fourth number.
A.	4.5
B.	5
C.	2
D.	4
Answer» E.

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The average of first three numbers is three times of the fourth number. If the average of all four numbers is 5, then find the fourth number.

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