500
A bag contains 25 balloons: 15 red, 3 yellow, and 7 orange.
How many balloons of each color would you need to add to the original bag to make the probability of drawing a red balloon 1/2?
What is some possibilities: add 1 yellow and 4 oranges, or 2 yellows and 3 oranges, or 3 yellows and 2 oranges, or 4 yellows and 1 orange, or 5 yellows, or 5 oranges