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6 August, 18:10

Jennifer was going to sell all of her stamp collection to buy a video game. After selling half of them she changed her mind. She then bought fifteen more. How many did she start with if she now has 43?

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  1. 6 August, 22:04
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    Alright, we just need to reverse some operations done unto 43. Subtract the 15 from her collection.

    43 - 15 = 28.

    Sold half? Times half.

    28 * 2 = 56

    Make sure it works:

    56 - 28 = 28. 28 + 15 = 43.

    She had 56 cards to start with.
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