If the arithmetic mean of x, x + 3, x + 6, x + 9 and x + 12 is 10, then x = ?
A. 1
B. 2
C. 6
D. 4
Answer:D
If the arithmetic mean of x, x + 3, x + 6, x + 9 and x + 12 is 10, then x = ?
A. 1 B. 2 C. 6 D. 4