Question

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 1

Answer:

Arithmetic mean = (x+x+3+x+6+x+9+x+12)/5

or, 10 × 5 = 5x + 30

or, 5x = 20

or, x= 4

option D is correct.