Mathematics, 17.02.2020 00:56 aj12381

Todd uses 21 white tiles & 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?Explain.

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Todd uses 21 white tiles & some black tiles to make a mosaic. The mosaic has a total area of 144...