In a certain jar, 40% of the marbles were red and the rest were blue. After 21 red marbles were added and 6 blue marbles were removed, red marbles made up 55% of the marbles in the jar.
How many marbles were in the jar before the changes?
In a certain jar, 40% of the marbles were red and the rest were blue. After 21 red marbles were added and 6 blue marbles were removed, red marbles made up 55% of the marbles in the jar.
How many marbles were in the jar before the changes?