The average of two numbers is 5x. If one of the numbers is 2x+3, find the other number

Answer 1

one number is 2x+3, the other number is y. their average = 5x

(2x+3+y)/2 = 5x

2x+3 +y = 10x

8x -y = 3

8x =3+y

x=0 y=-3

x=1 y=5

x=2 y-13

x=-3 y=21

there are an infinite number of values for the two numbers, unless more information is given