Jason bought 7 new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now only 30 cards left. How many cards did he start with?

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01-01-2021
Mathematics

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Jason bought 7 new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now only 30 cards left. How many cards did he start with?

Sagot :

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