Respuesta :

40 is your answer! let me know if you need more help!

Answer:

The sum of the 2 numbers is 40.

Step-by-step explanation:

x - y = 20

x^2 - y^2 = 800

x^2 - y^2 = (x - y)(x + y)  so:

800 = 20(x + y)

x + y = 800/20

so x + y = 40

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