Question 1183842

let Mor's age be {{{m}}}and Sara's age {{{s}}}

given:

{{{m=s+30}}}.....eq.1
{{{m+s=60}}}.....eq.2
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substitute {{{m}}} from eq.1 in eq.2

{{{s+30+s=60}}}

{{{2s=60-30}}}

{{{2s=30}}}

{{{s=15}}}

then

{{{m=15+30}}}

{{{m=45}}}


Mor is {{{45}}} and Sara is  {{{15}}} years old.