Kelly puts string cheeses in her kids lunches 5 days per week. Her oldest wants 2 every day and her youngest will only eat 1. The packages come with 30 string cheeses per pack. How many packages of string cheese will Kelly need to fill her kids lunches for 4 weeks? Let's answer step by step:
Her oldest wants 2 strings cheeses a day for 5 days so 2 * 5 = 10 string cheeses. Her youngest wants 1 string cheese a day for 5 days so 1 * 5 = 5 string cheeses. Together they want 10 + 5 = 15 string cheeses a week. Over 4 weeks, her kids will eat 15 string cheeses so 4 * 15 = 60 string cheeses. The bags have 30 per pack and she needs 60 so 60 / 30 = 2 packs of string cheese. The answer: 2.