Question 749561
Convert the 40in measurement to feet:

{{{40in*1ft/12in}}}

Reduce:

{{{(4*10ft)/(4*3)}}}


{{{10ft/3}}}

Now find the area:

{{{A=l*w}}}

{{{A=9ft*10ft/3}}}


{{{A=90ft^2/3}}}


{{{A=(3*30ft^2)/3}}}


{{{A=30ft^2}}}