On a particular week, Fatima's restaurant served 25 people food and drinks, and 3/5 of that number came to buy coffee. How many people did not buy coffee in the restaurant?
The number of customers who were served coffee in the restaurant is 3/5*25 = 
<gadget id="calculator">3/5*25</gadget>
<output>15</output>
15.
If the total number of customers who came to the restaurant was 25, then 25-15 = 
<gadget id="calculator">25-15</gadget>
<output>10</output>
10 customers did not buy coffee.

<result>10</result>