Question

two neon signs are turned on at the same time.both signs blink as they are turned on.one sign blinks every 9 second's.the other every 15 seconds.in how many seconds will they blink together again

Answer 1

they will blink together again at 45 seconds

Answer 2

for this question you have to find the lowest common multiple of 9 and 15. there are a few ways to do that. in this case the lowest common multiple (LCM) is 45. this means that both lights will blink at the same time again after 45 seconds.