Question 574420
the prime factors of 27 are ___ 3 * 3 * 3


the prime factors of 15 are ___ 3 * 5


so the prime factors of the LCM are ___ 3 * 3 * 3 * 5
___ this is the smallest number that is evenly divisible by 27 and 15
___ (and the number of minutes till the buses arrive together again)