# Bake Cookies Day (Dec. 18) Meeting (Multiple Topics)

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6 Problem 10. A customer who buys 2 and then gets 1 free is getting 3 cookies for 60 cents. This is an average of 60 3 = 20 cents per cookie. Problem 11. Letting x = total number of cookies sold, we can solve this problem with the ratio 30/2.5 = x/100. Using cross-products we get 2.5x = Dividing both sides by 2.5 gives us x = Problem 12. We re told 12 kids can eat 50 dozen cookies in 1 day. In 3 days, these same 12 kids will eat 50 3 = 150 dozen. (Notice that not all three values change just two of them.) So now we have 12 kids, 150 dozen, 3 days. However, we want 20 kids. What would 2 kids eat? (This is a sixth of the number of kids we currently have.) We can see 2 kids would eat 150/6 = 25 dozen in 3 days. Now let s go to 10 times the number of kids these 20 kids would eat = 250 dozen cookies in 3 days. Copyright MATHCOUNTS, Inc MATHCOUNTS Club Resource Guide Solution Set

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