<PRE><B>Question 975706</B>
Let L be the lenght of thr rectangle,and w be the width of the rectangle.
 from your question,
  L=w+10---(1)
and,
2(L+w)=80
L+w=40----(2)
put equ 1 in 2
w+10+w=40
2w+10=40
2w=40-10
2w=30
2w/2 = 30/2
w=15m
substitute for w in equ (1)
L=w+10
L=15+10
L=25m
The lenght nd width of the rectangle is 15m nd 25m respectively.

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