two positive integers have a sum of 20 and a product of 91. what is the smaller number?
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Let one number be x, then the other number will be 20 - x.
Their product = x*(20 - x) = 20x - x² = 91
x² - 20x + 91 = 0
(x - 13)(x - 7) = 0
x = 13 or x = 7
The smaller number is 7
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