Question 1138804


Joe is {{{35}}} and his son is {{{5}}}. 

In {{{x}}} years will Joe be exactly three times as old as his son:

{{{35+x=3(5+x)}}}

{{{35+x=15+3x}}}

{{{35-15=3x-x}}}

{{{20=2x}}}

{{{x=10}}}

answer: In {{{10}}} years will Joe be exactly three times as old as his son.

check:

now, Joe is {{{35}}} and his son is {{{5}}}

in {{{10}}} years, Joe is {{{45}}} and his son is {{{15}}}

and {{{45=3*15}}} which confirms our solution