Question 1050114
Sam's age = {{{x}}}
his brother's age = {{{x + 7}}}
mother's age = {{{3x-4}}}
{{{x+(x+7)+(3x-4)=63}}}
{{{x+x+7+3x-4=63}}}
{{{5x+7-4=63}}}
{{{5x+3=63}}}
{{{5x=63-3}}}
{{{x=60/5}}}
{{{x=12}}}
Sam's age = {{{x}}} = {{{12}}}
his brother's age = {{{x + 7}}} = {{{12+7}}} = {{{19}}}
mother's age = {{{3x-4}}} = {{{3(12)-4}}} = {{{36-4}}} = {{{32}}}