Q: Carl is hosting an open house for his new business. He knows 50 people will show up and hopes that another 40 people will randomly show up. He's created 10 extravagant gift bags for the first 10 people who visit his shop. He's made average gift bags for 20 people but needs to make enough for everyone who visits to have one. How many more bags does he need to make?
A: 60
Explain how we arrive at this answer:
Explanation: He knows 50 people are showing up and he's hoping 40 more people will drop in for a total of 50 + 40 = 90 people. He's made 10 extravagant gift bags and 20 average bags for a total of 10 + 20 = 30 bags. He hopes 90 people will show up and has already made 30 bags so he needs to make 90 - 30 = 60 more gift bags.