Question
The ratio of Lilian's pens to Rael's pens at first was 3 : 7. After Lilian gave Rael 50 pens, the ratio of Lilian's pens to Rael's pens is 1 : 3. What was the number of pens they had altogether?
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The ratio of Lilian's pens to Rael's pens at first was 3 : 7. After Lilian gave Rael 50 pens, the ratio of Lilian's pens to Rael's pens is 1 : 3. What was the number of pens they had altogether?