Question

A red string of holiday lights blinks every once 3 seconds while a string of blue lights blink once every 4 seconds how many time will bits sets of lights blink in 1 minute

Answer 1

35 times a minute

Explanation:

the red string blinks (60/3=)20 times a minute.

The blue light blinks (60/4)=)15 times a minute.

In total, 20+15=35.