Out of four numbers, the average of the first three numbers is thrice the fourth number. If the average of the four numbers is 5, the fourth number is:
A. 4.5
B. 5
C. 2
D. 4
Answer:C
Out of four numbers, the average of the first three numbers is thrice the fourth number. If the average of the four numbers is 5, the fourth number is:
A. 4.5 B. 5 C. 2 D. 4