Question 951569
x=width; L=length=x+3cm;P=perimeter=2(L+x)=62 cm
P=2(L+x) 
62cm=2(L+x) Divide each side by 2.
31cm=L+x Substitute for L.
31cm=x+3cm+x Subtract 3cm from each side.
28cm=2x Divide each side by 2.
14cm=x ANSWER: The width of the rectangle is 14cm.