Nahom had n baseball cards, and Semir had s baseball cards. They combined their baseball cards and then sold 10 of them.
1 answer:
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Try this:
1. sum of numbers is x+y=67, the difference between them is x-y=11
2. it is possible to make up and resolve the system:
1. sum of numbers is x+y=67, the difference between them is x-y=11
2. it is possible to make up and resolve the system: