A survey of 100 persons at Better Widgets finds that 40 jog, 25 swim, 16 cycle, 15

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A survey of 100 persons at Better Widgets finds that 40 jog, 25 swim, 16 cycle, 15 both swim and jog, 10 swim and cycle, 8 jog and cycle, and 3 persons do all three. How many people at Better Widgets do not take part in any of these three exercise programs?

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