Question

A red string of holiday lights blinks once every 3 seconds,while a string of blue lights blinks every 4 seconds.how many times will both sets of light blink at the same Time in 1 minute?

Answer 1

The answer would be five times.

A common factor of 3 and 4 is 12.

Since there are 60 seconds in a minute, you would divide 60 by 12.

60/12=5.

Thus, your answer is 5 times.

Answer 2

The red light string will blink 20 times and the blue 15 60 divided by 4 is 15 & 60 divided by 3 is 20