Question 1152143

Mr H is {{{12}}} years older than Mrs S.
 
{{{H=S+12}}}......eq.1


The sum of their ages is {{{80}}}. 

{{{H+S=80}}}......eq.2


substitute {{{H}}} from eq.1


{{{S+12+S=80}}}......eq.2

{{{2S=80-12}}}

{{{2S=68}}}

{{{S=34}}}


go to {{{H=S+12}}}......eq.1, substitute {{{S}}} 

{{{H=34+12}}}

{{{H=46}}}



Mr H is {{{46}}} years old, and Mrs S is {{{34}}} years old