Kai Xuan and Zi Yang had 440 marbles altogether. Kai Xuan gave 50% of his marbles to Zi Yang. Zi Yang then gave 50% of his marbles to Kai Xuan. In the end, Kai Xuan had 280 marbles. How many marbles did Zi Yang 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.