SOLUTION: Todd uses 21 white tiles and some black tiles to make a mosaic.the mosaic has a total area of 144 square centimeters. Each tile has an area of 3 square centimeters. How many black

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Question 1069750: Todd uses 21 white tiles and some black tiles to make a mosaic.the mosaic has a total area of 144 square centimeters. Each tile has an area of 3 square centimeters. How many black tiles did Todd use?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The total number of tiles is:
+144%2F3+=+48+
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+21+ white tiles have a total
of +3%2A21+=+63+ cm2
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The remaining area is:
+144+-+63+=+81+ cm2
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+81%2F3+=+27+
There are 27 black tiles
------------------------------
check:
+21+%2B+27+=+48+ tiles total
OK