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math question on practice test. [#permalink]
14 Aug 2008, 16:38
hello, I was just wandering if anyone could answer this question? Question, to meet a government requirement, a bottler must test 5% of its spring water and 10% of its sparkling water for purity. If a customer ordered 120 cases of spring water and 80 cases of sparkling water, what percent of all the cases must the bottler test before he can send it out? I got the answer 7.5% and not 8% like the answer key says. Thanks