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The greatest common divisor of two positive integers is $(x+5)$ and their least common multiple is $x(x+5)$, where $x$ is a positive integer. If one of the integers is 50, what is the smallest possible value of the other one?

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User Skeeve
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1 Answer

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Let's denote the two positive integers as A and B. We are given that the greatest common divisor (GCD) of A and B is (x + 5), and their least common multiple (LCM) is x(x + 5).

We know that for any two positive integers A and B, the relationship between their GCD and LCM is given by:

GCD(A, B) * LCM(A, B) = A * B

Substituting the given values, we get:

(x + 5) * x(x + 5) = 50 * B

Simplifying the equation:

x(x + 5)^2 = 50 * B

Since x and (x + 5) are both positive integers, we can consider the smallest possible value for x. Let's start with x = 1:

1(1 + 5)^2 = 6^2 = 36

We see that 36 is a factor of 50 * B. The smallest possible value of B can be found by dividing 50 by the GCD (x + 5), which is 6:

B = 50 / (x + 5) = 50 / 6 = 25/3

Since B must be a positive integer, the smallest possible value of B is 25. Therefore, the other positive integer is 25.
answered
User Li Dong
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