1. Greg opened the little bag. “It’s only got red and blue marbles in it,” he said. “Don’t look, but take out one marble.” John did just that. “See, Dad. I drew a red,” he said. “How many reds are there?” “I’ll give you a clue,” his father replied. “If I removed three more reds and two blues, the odds of you drawing a red when you draw again would become a third of what they were.” How many reds and blues were there originally?

Originally 6 red, 12 blue marbles

Originally 4 red, 9 blue marbles

Originally 5 red, 10 blue marbles