<PRE><B>Question 173103</B>
area of sidewalk is 136 sq m

Park measurements:
Let w = width of park
then
3w = length of park (2 times greater is 3 times as much)
If it were 1 time greater, that would be 2x.  2x greater is an increase of 2, for a total of 3)
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Park plus walk measurements:
w+4 = width
3w+4 = length
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(w+4)(3w+4) - w(3w) = 136
3w^2+4w+12w+16 - 3w^2 = 136
4w+12w+16 = 136
16w+16 = 136
16w = 120
w = 7.5 m (width)
Length = 3w = 22.5 m
Area = 7.5*225 = 168.75 sq meters</PRE>