Question
The ratio of Natalie's coins to Isaiah's coins at first was 3 : 7. After Natalie gave Isaiah 72 coins, the ratio of Natalie's coins to Isaiah's coins is 1 : 3. What was the number of coins they had in total?
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The ratio of Natalie's coins to Isaiah's coins at first was 3 : 7. After Natalie gave Isaiah 72 coins, the ratio of Natalie's coins to Isaiah's coins is 1 : 3. What was the number of coins they had in total?