Question 916618

The board is {{{15ft}}} long.

if
the smaller part is labeled {{{x}}}
the larger part is labeled {{{2x}}}

then {{{x+2x=15ft}}} solve for {{{x}}}

{{{3x=15ft}}} 

{{{x=15ft/3}}}

{{{x=5ft}}}

the smaller part is {{{x=5ft}}} long, and the larger part is {{{2x=10ft}}}