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5 July, 16:49

Jennifer bought a textbook with 2/7 of her money. She then bought a notebook with 3/5 of her remaining money and was left with $12. How much money did she start with.

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  1. 5 July, 16:53
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    X=amount of money at first

    price of a textbook=2/7 x

    her remaining money after she bought his textbook was: x - 2/7 x=5/7 x

    price of the notebook: (3/5) (5/7 x) = 3/7x

    her remaining money after she bought his notebook was $12

    We can suggest this equation:

    2/7 x + 3/7 x + 12=x

    lowest common multiple=7

    2x+3x+84=7x

    7x-2x-3x=84

    2x=84

    x=84/2

    x=42

    Answer: the amount of money at first was $42.
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