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| Math Central | Quandaries & Queries |
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Question from cory, a student: How many gallons of oil will be needed to raise a 4" plunger 25 feet? |
Hi Cory,
There are 231 cubic inches in a US gallon so you need to find the volume in cubic inches. It sounds like you have a circular cylinder with a radius of 2 inches and a height of 25 feet, The volume of a circular cylinder is
π r2 h
where r is the radius and h is the height. Convert the height to inches, find the volume in cubic inches and then convert this volume to gallons.
Penny
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