The ratio of Marcus's marble collection to Ben's marble collection was 3:2. After Marcus won 24 more marbles and Ben lost 9 marbles in a game, the new ratio became 3:1. How many marbles did Marcus have at first?
Opening the drawing…
MathBrush is being tested with a few parent groups, and every solution on the site is open to them. If you were given a code, it goes in once and this device remembers it. 65 worked examples are free to everyone without one.