Question
The ratio of William's stamps to Emily's stamps at first was 3 : 7. After William gave Emily 85 stamps, the ratio of William's stamps to Emily's stamps is 1 : 4. What was the number of stamps they had altogether?
2 m

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The ratio of William's stamps to Emily's stamps at first was 3 : 7. After William gave Emily 85 stamps, the ratio of William's stamps to Emily's stamps is 1 : 4. What was the number of stamps they had altogether?