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16 June, 16:08

A football filters that is 60 m wide and 110 m long is being paved over to make a parking lot. The builder ordered 660,000,000 cm3 of cement. How thick must the cement be to cover the field using 660,000,000 cm3 of cement?

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  1. 16 June, 18:45
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    The answer is 10 cm

    Imagine cement cover as a rectangle which volume is 660,000,000 cm3. So this rectangle has width (w = 60m), length (l = 110m), and height (h = ?). The height of the rectangle is actually a thickness of the cement layer. So, we will use the formula for the volume (V) of the rectangle to calculate the thickness:

    V = w · l · h

    It is given:

    V = 660,000,000 cm³

    w = 60 m = 60 · 100 cm = 6,000 cm

    l = 110 m = 110 · 100 cm = 11,000 cm

    h = ?

    Using the formula: V = w · l · h

    660,000,000 = 6,000 · 11,000 · h

    660,000,000 = 66,000,000 · h

    ⇒ h = 660,000,000 : 66,000,000 = 10 cm
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