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Tom had some cards. He lost 4/7 of them in school. If he had 91 cards at first, how many cards had he left?

 Nov 3, 2021
 #1
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\(91 \cdot (1 - \frac{4}{7}) = 91 \cdot \frac{3}{7} = 39\)

 

Thus, Tom had 39 cards left. 

 Nov 3, 2021

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