Answer: The required fraction is

Step-by-step explanation: Given that we have $15 and we spend $4 on a sandwich, drink, and chips.
We are to find the fraction of the money that we spent.
According to the given information, we have
Total amount of money = $15
and
the amount of money that we spent = $4.
Therefore, the fraction of money that we spent is given by

Thus, the required fraction is
