math
posted by layla .
give the dimensions of rectangles with perimeters of 70ft and length to width ratios of 3to4 4to5 and 1to1

The 1:1 case is obviously a square, with length and width both equal to 70/4.
Try the others yourself.
If (width)/(length) = 3/4,
L = (4/3)W
70 = 2(L + W) = (14/3)W
Solve for W