Question

if x and 7 is A.M of
9 then x is what?​

Answer 1

Answer:

11

Step-by-step explanation:

A.M of x and y = (x+y)/2

given A.M of x and 7 is 9

⇒ (x + 7)/2 = 9

⇒ x + 7 = 18

∴x = 11