There are two numbers a and B, their greatest common factor is 6, the least common multiple is 90, what is the sum of two natural numbers a and B

fifty-one

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13. a. If B is two natural numbers and a = 36, then the greatest common factor of a and B is () and the least common multiple is ()
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16. Three natural numbers, their least common multiple is 24, the greatest common factor is 3, the sum of these three natural numbers is the largest______ ．
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18. a. B is a natural number, a + B = 12, then the least common multiple of a and B is (), and the greatest common divisor of a and B is ()
19. Two two digit natural numbers, the greatest common divisor is 8, and the least common multiple is 96. What is the number?
20. If the difference between two natural numbers is 5 and the difference between their least common multiple and greatest common divisor is 203, what is the sum of the two numbers? By the way, is there any relationship between the least common multiple and the greatest common divisor?