Question

a red string of Holiday Lights blinks once every 3 seconds while they string a blue light blinks once every 4 seconds how many times with both sets of lights blink at the same time in 60 Seconds

Answer 1

Well, first find the GCF of 3 and 4, which is 12
Next divide 60 by 12, which would = 5
So the lights will blink 5 times