Question
The ratio of William's pens to Emma's pens at first was 3 : 7. After William gave Emma 68 pens, the ratio of William's pens to Emma's pens is 1 : 3. What was the number of pens they had in all?
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The ratio of William's pens to Emma's pens at first was 3 : 7. After William gave Emma 68 pens, the ratio of William's pens to Emma's pens is 1 : 3. What was the number of pens they had in all?