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3 May, 15:54

Todd has 21 white tiles dnd 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. How many black tiles did Todd use?

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  1. 3 May, 17:27
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    Answer:the number of black tiles that Todd used is 27

    Step-by-step explanation:

    Let x represent the number of black tiles that Todd used.

    Todd has 21 white tiles and some black tiles to make a mosaic. Each tile has an area of 3 square. It means that the total area of the white tiles is 21 * 3 = 63 cm^2

    The total area of the white tiles is x * 3 = 3x cm^2

    The mosaic has a total area of 144 Square centimeters. It means that

    3x + 63 = 144

    3x = 144 - 63 = 81

    x = 81/3 = 27
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