SOLUTION: please help me solv this hard area question, please and thank, even if you try. Problem= Courtney is making 72 cookies. She will make rectangles and cut them into triangles. Ea

Algebra ->  Surface-area -> SOLUTION: please help me solv this hard area question, please and thank, even if you try. Problem= Courtney is making 72 cookies. She will make rectangles and cut them into triangles. Ea      Log On


   



Question 83334: please help me solv this hard area question, please and thank, even if you try.
Problem=
Courtney is making 72 cookies. She will make rectangles and cut them into triangles. Each rectangle will be 2 inches by 4 inches.What is the area of each cookie? Is she wants to put icing on them, how many cans will she need if each can will cover 48 square inches?

Found 2 solutions by stanbon, jim_thompson5910:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Courtney is making 72 cookies. She will make rectangles and cut them into triangles. Each rectangle will be 2 inches by 4 inches.What is the area of each cookie? Is she wants to put icing on them, how many cans will she need if each can will cover 48 square inches?
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Each rectangle is 8 sq inches and make two triangles.
Each cookie will be 4 sq inches.
72 cookies = 36 rectangles = 36*8 sq inches = 288 sq in.
288/48 = 6 cans of icing.
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Cheers,
Stan H.

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Since the area of a triangle is always half of the area of a rectangle with the same base and height, each cookie will have an area of

A=%282%2A4%29%2F2=8%2F2=4

So each cookie will have an area of 4 sq inches. So the total area is

Total area=72*4=288

So all the cookies combined make an area of 288 sq in. Now simply divide 288 by 48 to find out how many cans she'll need:
288%2F48=6

So she'll need 6 cans to ice every cookie