Question 1184104


let Kelly’s age be {{{x}}}
then, if Devante is{{{ 9}}} years older than Kelly, he is {{{x+9}}}

in {{{12}}} years Kelly will be {{{x+12}}}years old, and Devante will be {{{x+9+12=x+21}}}

if in {{{12}}} years the sum of their ages will be {{{73}}}, we have

{{{x+12+x+21=73}}}

{{{2x+33=73}}}

{{{2x=73-33}}}

{{{2x=40}}}

{{{x=20}}}

=> Kelly is {{{20}}} years old  now