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On a certain day, orangeade was made by mixing a certain amount of orange juice with an equal amount of water. On the next day, orangeade was made by mixing the same amount of orange juice with twice the amount of water. On both days, all the orangeade that was made was sold. If the revenue from selling the orangeade was the same for both days and if the orangeade was sold at $0.60 per glass on the first day, what was the price per glass on the second day?
这道题应该看比例。第一天橙汁的做法是1:1混合纯橙汁和水,也就是说一杯橙汁饮料里面含有1/2的纯橙汁;第二天饮料的比例是1:2,也就是说一杯橙汁饮料里含有1/3的纯橙汁。两天的销售收入是相等的。销售收入应该等于售价*数量。现在我们不知道所售的数量是多少,通过橙汁的比例来推算。假设每天有X的制作原料,每一杯橙汁饮料需要1/2的纯橙汁,那么每一天就可以制作X除以1/2杯纯橙汁=2X杯;同理对于第二天来说,一样有X的制作原料,但每杯橙汁饮料只需要1/3的纯橙汁,因此可以做出3X杯橙汁饮料。现在已知第一天的售价是0.6,求第二天的售价。就应该用0.6*2X=3X*P,算出P=0.4.
疑问:从哪里可以看出来,两天卖的饮料比例要相等呢。。。可不可以每天卖一杯,第一天比例是1:1,第二天1:2,然后价钱都等于0.6呢?
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