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Re: On selling a pen at 5% loss and a book at 15% gain, Karim gains Rs.7 [#permalink]
I set up 2 equations:

X book Y pen

3/20X -1/20Y = 7
1/10X + 1/20Y = 13

Solve for X = 80
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Re: On selling a pen at 5% loss and a book at 15% gain, Karim gains Rs.7 [#permalink]
Hello from the GMAT Club BumpBot!

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Re: On selling a pen at 5% loss and a book at 15% gain, Karim gains Rs.7 [#permalink]
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