ALL THE UNICORNS ON RAINBOW ISLAND ARE EITHER GREEN OR YELLOW. EVE...

12. All the unicorns on Rainbow Island are either green or yellow. Every time the clock strikesmidnight, some of the unicorns change their color. Yesterday, there were 6 green unicorns forevery 5 yellow ones. Today, there are 3 green ones for every 4 yellow ones. What is thesmallest possible number of unicorns living on Rainbow Island?