I have no idea how to approach this problem, please help.
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9 and 10 have no common factors. so if m/10 is an integer and m/9 is an integer then m/90 is an integer and m=90k for some k. 5 divides 90 so m/5 is an integer.
thanks, your solution works like a charm everytime. I'm so grateful
In fact, 5 divides 10 so "m/10 is an integer" is enough to say that "m/5 is an integer". "m/9 is an integer" is unnecessary.
(An this problem has nothing to do with "prime numbers".)
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