Exercises 1-4: Measuring the thickness of a very thin layer of material can be difficult to do directly. For example, with a ruler it would be difficult to measure the thickness of an oil film on water or a coat of paint. However, it can be done indirectly using the following formula.

That is, the thickness of a thin layer equals the volume of the substance divided by the area that it covers. For example, if a volume of 1 cubic inch of paint is spread over an area of 100 square inches, then the thickness of the paint equals 1 inch. Use this formula in the following exercises.

A 100-foot-long sidewalk is 5 feet wide. If 125 cubic feet of cement are evenly poured to form the sidewalk, find the thickness of the sidewalk.

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Thickness= Volume Area