Question 178025
Let x=length
y=width

The perimeter of a rectangle is 84 ft. So,
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2(x+y)=84
x+y=42
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the ratio of the width to the length is 2:5 so
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{{{y/x=2/5}}}
5y=2x
y=2x/5
</center>
Substituting this to x+y=42,
<center>
x+(2x/5)=42
(5x/5)+(2x/5)=42
7x/5=42
x/5=6
x=6*5=30>>length
x+y=42
y+30=42
y=42-30=12>>width
</center>
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