Question
The ratio of Raeann's stamps to Risa's stamps at first was 3 : 7. After Raeann gave Risa 120 stamps, the ratio of Raeann's stamps to Risa's stamps is 1 : 3. What was the number of stamps they had in total?
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The ratio of Raeann's stamps to Risa's stamps at first was 3 : 7. After Raeann gave Risa 120 stamps, the ratio of Raeann's stamps to Risa's stamps is 1 : 3. What was the number of stamps they had in total?