Question 967144
1) We are given a rectangle pan, make five horizontal cuts which divide the width into fifths and two vertical cuts that divide the length into thirds.  This gives us 15 brownies.
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2) 12/3 by 8/5 which is 4 inches by 1.6 inches 
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3) 15/4 = 3.75 brownies per person
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4) 2 (3/4) = 11/4 = 22/8 cups of flour, she need 3/8 cup of flour per pan, then
(22/8) / (3/8) = (22/8) * (8/3) = 22/3 = 7.33333, therefore
she can make 7 pans of brownies
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5) 2 (1/2) = 5/2 = 15/6 cups of cocoa, she needs 2/6 cup of cocoa per pan, then
(15/6) / (2/6) = (15/6) * (6/2) = 15/2 = 7.5, therefore
she has enough cocoa for 7 pans of brownies
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after 7 pans of brownies, she will have (1/3) cup of flour and (1/2) cup of cocoa left.  Note that (1/3) = (2/6) and (1/2) = (3/6), she will run out of flour first