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17 March, 20:25

Invention cost three dollars for a pack of eight. Laura gives the cashier $20 to buy inventions and gets $11 and change. How many packs of inventions does Laura by?

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  1. 17 March, 20:30
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    Laura buys 3 packs of inventions.

    20-11=9

    (amount given-change=actual cost)

    9 : 3 = 3

    (actual cost : dollars per pack = number of packs bought)
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