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There is a very easy way to do this type of thing:

Subtract the difference, then half the answer, this gives the smaller number. Add back the difference to get the larger number.

In this case 90 - 18 = 72; 72/2 = 36 then 36 + 18 = 54.

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14y ago
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Q: The sum of two numbers is 90 Their difference is 18 Find the numbers?
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