Answers

2015-12-15T00:09:25+05:30
Let
 
the length of the cable be a
total cost of the cable=200
cost of each metre=200/a
if length=a+5 and cost of each metre=200/a-2
then total cost=200
so,
200/(a-2)*(a+5)=200
200a-1000/a-2=200
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