On a string of red and blue lights, the red lights blink everyb3 seconds, and the blue lights blink every 5 seconds. How many times will they blink at the same time in one minute?
when will they blink together? what is the smallest number they both mutiply to 3*5=15 so every 15 seconds so at 15, 30, 45, 60 seconds so 4 times if you count the time exactly at 1 minute
