Question 1207790



let Jon's age be {{{J}}} and Alice’s age be {{{A}}}

if Jon is {{{4}}} years older than twice the age of  Alice, we have


{{{J=2A+4}}}........eq.1


if the sum of the spas in {{{25}}} years, we have

{{{J+A=25}}}...eq.2


substitute {{{J}}} from eq.1 in eq.2


{{{2A+4+A=25}}}...eq.2, solve for {{{A}}}

{{{3A=25-4}}}

{{{3A=21}}}

{{{A=7}}}


go to eq.1, substitute {{{A}}}


{{{J=2*7+4}}}........eq.1

{{{J=18}}}


so, Jon is {{{18}}} years old and Alice is {{{7}}} years old