2. A girl scout was selling cookies. Each box of cookies cost $3.50. Her first customer bought and paid for 3 boxes. Her second customer ordered 6 boxes, but did not pay for them. Her third
customer bought and paid for 6 boxes. Her fourth customer bought and paid for 2 boxes. If she
went home with $63.50, how much did she have to start with?

$25

Explanation:

Here is how an expression for much money the girl scout made that day

3*($3.50)+6*($3.50)+2*($3.50)

If we multiply and add everything from the equation above we get $38.50, the amount of money in dollars she made. To find how much money she started with we need to subtract the amount of money she made from the amount of money she ended up with, giving us something like this

$63.50-$38.50

After subtracting we find that the girl scout started with $25

try answer.com that works for me