6、7、8月分别工作20、17、19天,在这些工作日里打了168个电话,假如每个月打电话的数量之比和每个月的工作天数之比相同,问8月打了多少个电话?
20x + 17x + 19x =168
x = 3
8月打了3*19 = 57个
gmat数学Month Number of Days Worked June 20 July 17 August 19
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