12 question find two numbers with a sum of. 20 and a difference of 14

Let the two numbers be x and y.

The sum of two numbers is 20. So we can write:

x + y = 20

The difference of two numbers is 14. So we can write:

x - y = 14

Adding the two equations, we get:

2x = 34
⇒ 
x = 17

Using the value of x in 1st equation we get:

17 + y = 20
⇒
y = 3

So the two numbers are 17 and 3.

The decimal expansion would be .27 repeated