<PRE><B>Question 173103</B>
L=2W
AREA OF PARK=LW
AREA OF PARK=2W*W=2W^2
AREA WITH SIDEWALK=(2W+2*2)(W+2*2)
AREA WITH SIDEWALK=(2W+4)(W+4)
AREA WITH SIDEWALK=2W^2+12W+16
(2W^2+12W+16)-(2W^2)=136
12W=136-16
12W=120
W=10 M.
L=2*10=20 M.
PROOF:
20*10=200 M^2 FOR THE PARK
(20+4)(10+4)=200+136 M^2 FOR THE PARK PLUS THE SIDEWALK.
24*14=336
336=336

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