Question
The ratio of Jack's stamps to Abigail's stamps at first was 3 : 7. After Jack gave Abigail 84 stamps, the ratio of Jack's stamps to Abigail's stamps is 1 : 3. What was the number of stamps they had in all?
2 m

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The ratio of Jack's stamps to Abigail's stamps at first was 3 : 7. After Jack gave Abigail 84 stamps, the ratio of Jack's stamps to Abigail's stamps is 1 : 3. What was the number of stamps they had in all?