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Imagine an assembly line with three inspection points A, B [#permalink]
22 Mar 2008, 02:27
Imagine an assembly line with three inspection points A, B and C. Of every 10 unites inspected at point A, 2 are discarded as faulty. Of every 10 unites inspected at point B, 1 is discarded as faulty. Of every 8 unites inspected at point C, 1 is discarded as faulty. Of every 200 unites sent along the assembly line, how many are discarded at three inspection points. 126 115 85 74 54 Please explain your answer. Optional: time you spend on this question