Question

Two neon lights are turned one at the same time. One blinks every 4 seconds and the other blinks every 6 seconds. In 60 seconds, how many times will they blink together?

Answer 1

two neon lights turned on at same time.

one blinks                  other blinks
every 4 seconds        every 6 seconds.

ob   ob
4   :  6
60.

60 / 4 = 15
60 / 6 = 10.

15+ 10 = 25 times.

Answer 2

25 times it will blink