i know the answer now is 540 after 3 hours of trying to figure out the "least common multiple" but what does the 3rd number "10" serve purpose? because who would want to keep adding 10 mutiple times to get to 540? am i missing something here? i also matched 108 for both numbers but not "10" and it was incorrect, is there a glitch on this quiz? or is it really 540 since you have to match 3 numbers?