Human: Lyle wants to buy himself and his friends a sandwich and a pack of juice. A sandwich costs $0.30 while a pack of juice costs $0.2. If Lyle has $2.50, how many of his friends can have a sandwich and a pack of juice? Assistant:
A sandwich and a pack of juice cost $0.3 + $0.2 = $0.50.
With Lyle's $2.50, he can buy $2.50/$0.50 = 5 sets of sandwiches and juice.
Therefore, 5 - 1 = 4 of his friends can have a sandwich and a pack of juice since the other 1 set is for Lyle himself.