The sum of two numbers is 84 but one number is three times the other so what are the numbers?

Translate this word problem as a system of equations and then solve using subtraction.

The sum of two numbers is 84. One number is three times the other. What are the numbers?
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1 Answer

1.....x+y=84

2....y=3x

so x+3x=84

4x=84

x=84/4

x=21

y=36
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