Lizzy: Betty has a tray of cookies and a tray of brownies. She has a real sweet tooth and eats 3 cookies a day and 1 brownie a day. If she starts with 60 cookies and 10 brownies, how many more cookies than brownies does she have after a week of eating like this?.
Me: Hmmm, let me think. I think this is the detailed solution:
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First we find how many cookies Betty will eat in a week by multiplying her daily amount by 7, meaning 7 * 3 = 21 cookies eaten in a week. We repeat this for the brownies, finding she eats 7 * 1 = 7 brownies in a week. We subtract the 21 cookies from the original amount of 60, finding 60 - 21 = 39 cookies remaining. We repeat this step for the brownies, finding 10 - 7 = 3 brownies remaining. In the end, therefore, Betty has 39 - 3 = 36 more cookies than brownies. Final answer: 36.
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