Bobby Is 3 Years Older Than Chris Last Year The Sum Of Their Ages Was 39 How Old Is Each Now?

Bobby is 3 years older than chris last year the sum of their ages was 39 how old is each now?

Answer:

Chris is 19 years old while Bobby is 22 years old.

Computation:

Representation

$\left\begin{array}{ccc}Chris\:age:&x\\Bobbys\:age:&x+3\end{array}\right$

Solving for their ages last year.

$x+x+3=39\\2x=39-3\\2x=36\\x=36/2=18$

$x+3=18+3=21$

Solving for their ages now.

$Add\:1\:year\:to\:each\:of\:their\:ages\\Chris\:age:\:18+1=\boxed{19}\\Bobbys\:age:\:21+1=\boxed{22}$

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