Mathematics, 27.09.2021 14:00, briannarose2003

Noah is learning portugese, and he uses flash cards to study vocabulary. For every 5 new flash cards he practices, he reviews 10 old flash cards. Today , he practiced 45 flash cards in all. How many new flash cards did he practice?

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Noah is learning portugese, and he uses flash cards to study vocabulary. For every 5 new flash cards...