<PRE><B>Question 855712</B>
A rectangular security area is enclosed on one side by a wall, and the other sides are fenced. The length of the wall is twice the width of the area. The total cost of building the wall and fence is $13,200. If the wall costs $50 per meters and the fence costs $5 per meter find the dimension of the area. 
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let x=width
2x=length and wall
length of fencing=x+x+2x=4x 
5*4x+50*2x=13200
20x+100x=13200
120x=13200
x=110
2x=220
dimensions of area:110 by 220 meters</PRE>