In a restaurant, a burger costs $9, and a pizza twice as much. How much would cost one pizza and three burgers?
One pizza costs twice as much as the burger, which means 9 * 2 = $<T>multiply(9, 2)=18
Three burgers would cost 9 * 3 = $<T>multiply(9, 3)=27
So one pizza and three burgers would cost in total 18 + 27 = $<T>add(18, 27)=45
