0.07*0.6+0.145*0.4=0.1.也就是10%.0.6和0.4其實(shí)就是混合溶液里1和2所占的百分比.
這道題用概率論的方法來思考快一些,因?yàn)镚RE考試沒時(shí)間讓你算那么多的質(zhì)量出來,越快速的方法越好.
一道gre數(shù)學(xué)題
一道gre數(shù)學(xué)題
By weight,liquid A makes up 7.0 percent of solution 1 and 14.5 percent of solution 2.If 3grams of solution 1 is mixed with 2 grams of soluiton 2,then liquid A account for what percent what percent of the weight of the resulting solution?
By weight,liquid A makes up 7.0 percent of solution 1 and 14.5 percent of solution 2.If 3grams of solution 1 is mixed with 2 grams of soluiton 2,then liquid A account for what percent what percent of the weight of the resulting solution?
英語人氣:947 ℃時(shí)間:2019-10-08 13:38:26
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