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