Confusion about meaning of this question. High school Algebra level. –
math.stackexchange.com
The product of two numbers is 10. One of them is $a$. Express their sum in
terms of $a$. The factors of 10 are 1,2,5,10. Thus $a \in {1,2,5,10}$ Thus
the sum can be either 7 or 11. Now how …
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