SOLUTION: A viedo game has three villans which appear on screen at different intervals. One villan appears every 3 seconds, a second villan appears every 5 seconds, and a third villan appea

Question 40573: A viedo game has three villans which appear on screen at different intervals. One villan appears every 3 seconds, a second villan appears every 5 seconds, and a third villan appears every 12 seconds. When will all three villans appear at the same time? List all the possibilites ihn an organized way.
A)in 120 seconds B)in 150 seconds C)in 60 seconds D)in 30 seconds
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
the answers have to be multiples of all 3 numbers: 3, 5 and 12.

Looking at 5 and 12, we have 60, 120, 180, 240, etc.
3 also goes into each of these, so this set of numbers is the answer.

Jon.