Question 902678
Let A = Marty's age
Let B = Mickey's age
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Equation 1: {{{A = 35}}}
Equation 2: {{{5B = A + 20}}}
Plug 35 into equation 2 for A
Equation 2: {{{5B = A + 20}}}
{{{5B = (35) + 20}}}
{{{5B = 55}}}
Divide both sides by 5
{{{highlight(B = 11)}}}
Mickey is 11 years old