Gemma ordered four pizzas at $10 each, and she gave a $5 tip to the delivery person. How much change did she get back if she gives one fifty-dollar bill? Let's answer step by step:
The cost of the four pizzas is 4 x $10 = $40. The total cost, including the tip, is $40 + $5 = $45. Therefore, Gemma gets a change of $50 - $45 = $5. The answer: 5.