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?
A sandwich and a pack of juice cost $0.3 + $0.2 = $
<gadget id="calculator">0.3+0.2</gadget>
<output>0.5</output>
0.50.
With Lyle's $2.50, he can buy $2.50/$0.50 = 
<gadget id="calculator">2.5/0.5</gadget>
<output>5</output>
5 sets of sandwiches and juice.
Therefore, 5 - 1 = 
<gadget id="calculator">5-1</gadget>
<output>4</output>
4 of his friends can have a sandwich and a pack of juice since the other 1 set is for Lyle himself.

<result>4</result>