A shopkeeper bought pens at a rate of 12 pens for 150 rs and sold them at rate of 10 pens for 130rs.The number of pens he should sell to earn a net profit of 20rs is?

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  1. x(130/10) = x(150/12)+20
    x = 40

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  2. X is for what?

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  3. Sdx

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