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The ratio of length to width to height of a rectangular prism is 3:4:8. If the prism is 20 feet wide, what is the surface area of the prism?

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  1. 3 / 4 / 8 = L / 20 / h
    L/20 = 3/4 so L= 15
    20/h = 4/8 so h = 40
    ends = 2 (20 * 40)
    top and bottom = 2 ( 20 *15)
    sides = 2 (15*40)
    now add

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