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Two numbers $90$ and $m$ share exactly three positive divisors. What is the greatest of these three common divisors?

 Mar 19, 2019
edited by CorbellaB.15  Mar 19, 2019
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90 =1 | 2 | 3 | 5 | 6 | 9 | 10 | 15 | 18 | 30 | 45 | 90 (12 divisors)

9  = 1, 3, 9 (3 divisors)

9 would be the greatest

 Mar 19, 2019

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