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

The average of first three numbers is thrice the fourth number. If the

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

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

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