A waterpark opens up and charges $30 for admission.  Kids' tickets are half price.  If a group of people brings a soda, they can get 20% off the total price of admission.  Janet gets tickets for 10 people and 4 of them are children.  She buys a soda for $5 to take advantage of the discount for her group.  How much did she pay for everything?
She bought 10-4=<T>subtract(10, 4)=6 adult tickets
So 6*30=$<T>multiply(6, 30)=180 was the cost for adult tickets
Children tickets cost 30/2=$<T>divide(30, 2)=15.0 each
So the children tickets cost 15*4=$<T>multiply(15, 4)=60
So the total cost of tickets is 60+180=$<T>add(60, 180)=240
They get a 240*.2=$<T>multiply(240, 0.2)=48.0 discount
So the tickets cost 240-48=$<T>subtract(240, 48)=192
So in total she paid 192+5=$<T>add(192, 5)=197
