Question

If the arithmetic mean of x,x+3,x+b,x+9 and x+12 is 10 the x=​

Answer 1

Answer:

Step-by-step explanation:

x , x + 3 , x + b , x + 9 , x + 12

The CD is 3

=> x + 3 - x = x + b - x + 3

=> 3 = b - 3

=> b = 6

Now

$\frac{x+x+3+x+6+x+9+x+12}{5}=10\\\\5x+30=50\\\\5x=20\\\\x=4$

Therefore x = 4

Hope it Helps