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a + b = 77

a - b = 1

Add the two equations: 2a = 78, a = 39, so 39 - b = 1 : b = 38.

Check answer in first eq: 39 + 38 = 77

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what is the sum of two numbers is 77 and their product is 66

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Q: What are 2 numbers so the sum of two numbers is 77 and their difference is 1?
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