SAT一道数学题Pink paint is made by mixing 5 parts white with 1 pa

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SAT一道数学题
Pink paint is made by mixing 5 parts white with 1 part red paint.If Joseph uses this method for making pink paint and he has 3 gallons of white paint and 1 gallon red,what is the maximum amount of pink paint that Joseph can make?
答案是五分之十八,即3.6,

先占楼后答
再问：请答
再答：每份pink paint是由五份white paint和一份red paint加工而成
那么你有3 gal white paint 和 1 gal red paint 说明red paint用不完，答案就是用掉的white paint 加上用掉的 red paint 那么
3+3/5=18/5 gal
懂了吗？
再问： ok
再问： ok
再问：为什么红色只用了五分之三？
再答：每五分白色用一份红色，3份白色自然用去3/5红色啦

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