AMC 10 Step by Step
2004 AMC 10AProblem 11P11-15~2 minPrint

A company sells peanut butter in cylindrical jars. Marketing research suggests that using wider jars will increase sales. If the diameter of the jars is increased by 25%25\% without altering the volume, by what percent must the height be decreased?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site. Also appeared as 2004 12A #9.