Question 1081952
A board  = {{{ 4/9 }}} of a plank
and there are {{{ 4 }}} planks
I can say:
[ 1 board / (4/9) of a plank ] x [ 4 planks ] = [ number of boards ]
{{{ ( 1 / (4/9) )*4 }}}
{{{ ( 9/4 )*4 = 9 }}}
There are 9 boards