Answers

2014-11-01T19:37:02+05:30
Cost of notebook = x
cost of pen = y
 then
     x =2y
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2014-11-01T19:37:50+05:30
Let the cost of a pen be x
and let the cost of a notebook be y

A.T.Q

y=2x

OR

2x-y=0
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