Question 309906
a farmer has 800 yd of fencing to enclose a rectangular pasture, since one side 
of the pasture borders a river, that side does not need to be fenced.
 If the side perpendicular to the river must be twice as long as the side 
parallel to the river, what are the dimensions of the rectangular pasture?
:
Let x = the side parallel to river
then
2x = the two sides perpendicular to the river
:
x + 2(2x) = 800
x + 4x = 800
5x = 800
x = {{{800/5}}}
x = 160 yd the single side parallel to the river
and
2(160) = 320 yd the two sides perpendicular to the river
:
Pasture is 320 by 160 yds
:
Check: 160 + 2(320) = 800