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Math Help - area probelms

  1. #1
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    area probelms

    1.How many 4' * 8' sheets of drywall do you need for the walls of a 12' * 20' room, 8ft high?

    2.If ceramic tiles are 8'' * 8'', how manyu tiles would it take to cover an area 4' * 6'?

    3. if a customer buys 20 2 * 4's 8ft long, at $4.75 each, how much would the 2 * 4's cost?
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  2. #2
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    [quote=raheel101;185090]1.How many 4' * 8' sheets of drywall do you need for the walls of a 12' * 20' room, 8ft high?

    See here,

    Area of four walls (on which you need dry-walls)  = 2\times (12 + 20) \times 8= 512 \;ft^2

    Area of one sheet of dry-wall = 4 \times 8 = 32 \;ft^2

    Number of drywalls = \frac {512}{32}= 16
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  3. #3
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    2.If ceramic tiles are 8'' * 8'', how manyu tiles would it take to cover an area 4' * 6'?

    See here,

    Area to be covered = 4 \times 6 = 24 \;ft^2= 24\times 144 \;in^2 = 3456\;in^2

    Area of one tile = 8 \times 8= 64 \;in^2

    Number of tiles = \frac{3456}{64}=54
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