Problem 11 · Working backwards · 3 points
Made by AI and not reviewed by a real person.
Milo moves 1 button from the left box to the right box. Now each box has 3 buttons. How many buttons were in the left box before the move?
- 2
- 4
- 6
- 3
- 5
Show a hint
- Draw a 'before' picture and an 'after' picture of the boxes. Use an arrow to show which way the button moved, and fill in what you know about the after picture.
- The left box lost a button during the move. How can you undo that change to find its earlier count?
Show the answer and solution
Answer: B — 4
The left box has 3 buttons now. Milo took 1 button from it, so before the move it had 3 + 1 = 4 buttons. The correct choice is 4. Choosing 2 would mean taking another button away from the left box, instead of undoing the move.