Lizzy: James earns $10 per week as an allowance. After saving all his money for four weeks, he spends half of it on a new video game. He then spends a quarter of what is left to buy a new book. How much money does he have left?.
Me: Hmmm, let me think. I think this is the detailed solution:
He starts out with $10 * 4 = $40. James spend $40 / 2 = $20 on the video game. After buying the game, he has $40 - $20 = $20 left. He spent $20 / 4 = $5 on the book. He has $20 - $5 = $15 left. Final answer: 15.