Question 712501
x = Juan's dollar
3x = Felipe's dollars  {Felipe gets 3 for Juan's 1}


x + 3x = 3600 {added how much each made to be equal to 3600}
4x = 3600 {combined like terms}
x = 900 {divided each side by 4}
3x = 2700 {substituted 900, in for x, into 3x}


Felipe made $2700
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