Respuesta :

slysoph
To set up the equation it would be:

3x + x = 120

Then you solve for x

4x = 120
x = 30

Then finally you substitute x = 30 into the original equation:

3(30) + (30) = 120
90 + 30 = 120

The two numbers that add up to 120 and one is three times the other are: 90 and 30

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