Question
The ratio of Zoey's pens to Ella's pens at first was 2 : 5. After Zoey gave Ella 105 pens, the ratio of Zoey's pens to Ella's pens is 1 : 4. What was the number of pens they had in all?
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The ratio of Zoey's pens to Ella's pens at first was 2 : 5. After Zoey gave Ella 105 pens, the ratio of Zoey's pens to Ella's pens is 1 : 4. What was the number of pens they had in all?