要将含盐为15%的盐水20千克,变为含盐20%的盐水,需要加入纯盐多少千克?
要将含盐为15%的盐水20千克,变为含盐20%的盐水,需要加入纯盐多少千克?
数学人气:898 ℃时间:2019-10-10 00:41:24
优质解答
设加入纯盐x千克,根据题意得:20×15%+x=(20+x)×20% 3+x=4+0.2x 3-3+x=4-3+0.2x x=1+0.2x x-0.2x=1+0...
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