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24-01-2017
Mathematics

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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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Аноним Аноним

24-01-2017

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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