L = 15.6 inches
W = 19.4 inches
For a Rectangle, the Perimeter P = 2W + 2L
70 = 2W + 2L
Half of this would give the individual sides
35 = W + L
L/W = 4/5
For the proportion to work we must compare totals to totals 4 + 5 = 9
L/35 = 4/9 Cross multiply to isolate L
L = 35 * 4/9 = 15.6
W/35 = 5/9
Cross multiply to isolate W
W = 35*5/9 = 19.4
L = 15.6 inches
W = 19.4 inches
Check the ratio
4/5 = 0.8
15.6/19.4 = 0.8
Check the Perimeter
70 = 2(15.6) + 2(19.4)
70 = 31.2 + 38.8
70 = 70
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