Lizzy: Phill had some friends over for pizza. He opens the pizza box and discovers it hasn't been sliced. Phill cuts the pizza in half, and then cuts both halves in half, and then cuts each slice in half again. Phill then passes out 1 slice to 3 of his friends and 2 slices to 2 of his friends. How many slices of pizza are left for Phill?.
Me: Hmmm, let me think. I think this is the detailed solution:
Phill starts with 1 pizza, cutting it in half. This means he now has 1 * 2 = 2 slices of pizza. He cuts each of these 2 slices in half, meaning he now has 2 * 2 = 4 slices of pizza. He then cuts these in half again, meaning he now has 4 * 2 = 8 slices of pizza. Phill hands out 2 slices to 2 of his friends, meaning he gave out 2 * 2 = 4 slices. He hands out 1 slice to 3 others, so the total amount of slices handed out are 3 + 4 = 7 slices. Since Phill started with 8 slices, this means he has 8 - 7 = 1 slice remaining. Final answer: 1.