there are some kilos of salt water which is 4% concentrated

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there are some kilos of salt water which is 4% concentrated ,it becomes 10% concentrated
after evaporating ,then it becomes 6.4% concentrated after adding 300 grams of salty water which is 4% concentrated .how many kilos of slaty water are there originally?

假设有未知公斤的盐水,浓度为4%.蒸发后,浓度为10%.再加入浓度为4%的盐水300g后,盐水的浓度为6.4%.请问,最初的盐水是多少公斤?
设最初的盐水为X公斤
①4%·X 是最初盐水中盐的质量
② [（4%·X ）+ 300·4%] / 6.4% 加了300g 4%浓度的盐水之后,盐水的质量
③ [（4%·X ）+ 300·4%] / 6.4% - 300 蒸发后盐水的质量
④ { [（4%·X ）+ 300·4%] / 6.4% - 300}·10% 是蒸发后盐水中所含盐的质量
因为从最开始到蒸发后,盐水中盐的质量一直没有变化,所以①=④
4%·X = { [（4%·X ）+ 300·4%] / 6.4% - 300}·10%
备注：·是乘号,/是除号
这是我帮你推导出的算式啦我喜欢化学,但是好久好久没做过数学题了,见谅啦!

there are some kilos of salt water which is 4% concentrated two kilos of salt 后面跟are 还是is? There ___________5 kilos of water in the bottle.用is还是用are 改错：There is some bottles of water. 英语翻译There are lot of salt wells in Sichuan.A salt well is mu 英语：1.There is some meat on the plate.2.There are (10 kilos)o there ___ some bottles of water on the table.请问填are还是is? there are some water in the bottle 改错 there is some water in There is some water There is a lot of water a lot of是不是等于lot There are some bottles of water beside them.翻译 there ( )some water in the glass. A.are B.is There is a lot of water There is some water两句都对吗