Question: Betty and Dora started making some cupcakes at the same time. Betty makes 10 cupcakes every hour and Dora makes 8 every hour. If Betty took a two-hour break, what is the difference between the number of cupcakes they made after 5 hours?
Solution:
Dora made 8 cupcakes per hour for 5 hours for a total of 8*5 = 40 cupcakes
Betty took a 2-hour break so she spent 5-2 = 3 hours making cupcakes
Betty made 10 cupcakes per hour for 3 hours for a total of 10*3 = 30 cupcakes
The difference between the number of cupcakes they made is 40-30 = 10 cupcakes
Answer: 10