Question
The ratio of Michael's cards to Ethan's cards at first was 3 : 7. After Michael gave Ethan 30 cards, the ratio of Michael's cards to Ethan's cards is 1 : 3. What was the number of cards they had in total?
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The ratio of Michael's cards to Ethan's cards at first was 3 : 7. After Michael gave Ethan 30 cards, the ratio of Michael's cards to Ethan's cards is 1 : 3. What was the number of cards they had in total?