Question 1152958

let Stephen's age be {{{x}}} and Wendy's age {{{y}}}

if Stephen is {{{64}}} years {{{younger}}} than Wendy, we have

{{{x=y-64}}}.....eq.1 

 
if {{{7}}} years ago, Wendy's age was {{{3}}} times Stephen's age,we have

{{{y-7=3(x-7)}}}.......substitute {{{x}}} from eq.1 and solve for {{{y}}}

{{{y-7=3(y-64-7)}}}

{{{y-7=3(y-71)}}}

{{{y-7=3y-213}}}

{{{213-7=3y-y}}}

{{{206=2y}}}

{{{y=103}}}

go to

{{{x=y-64}}}.....eq.1, substitute {{{y}}}

{{{x=103-64}}}

{{{x=39}}}

 Stephen is {{{39}}} old now