问下这道gre数学how many qarts of pure alcohol must you add to 15 quarts of solution that is 40% alcohol to strengthen it to a solution that is 50% alcohol?

来源：学生作业帮助网 编辑：作业帮 时间：2024/05/11 13:14:02
问下这道gre数学how many qarts of pure alcohol must you add to 15 quarts of solution that is 40% alcohol to strengthen it to a solution that is 50% alcohol?

问下这道gre数学how many qarts of pure alcohol must you add to 15 quarts of solution that is 40% alcohol to strengthen it to a solution that is 50% alcohol?
问下这道gre数学
how many qarts of pure alcohol must you add to 15 quarts of solution that is 40% alcohol to strengthen it to a solution that is 50% alcohol?

问下这道gre数学how many qarts of pure alcohol must you add to 15 quarts of solution that is 40% alcohol to strengthen it to a solution that is 50% alcohol?
现有40%酒精15夸脱,你加入多少纯酒精才能让液体浓度达到50%?
设你要加入的为x夸脱,则
15*40% + x*100% = (15 + x)*50%
解得 x = 3

问下这道gre数学how many qarts of pure alcohol must you add to 15 quarts of solution that is 40% alcohol to strengthen it to a solution that is 50% alcohol? Gre数学. how many how many, 【GRE数学】How many positive integers less than 20 are equal to the sum of a positive multipleHow many positive integers less than 20 are equal to the sum of a positive multiple of 3 and a positive multiple of 选项：2;5;7;10;19 GRE数学考多久 gre数学难不难 gre数学低怎么办 【GRE】数学 如图 GRE数学.15题 Gre数学.22题 GRE数学怎样备考 how many how 提问几道GRE数学题!都是绿皮上的,本人数学不大好,P275.39In how many of the integers between 1 and 100 does the digit 5 occur exactly once?答案是18,题目啥意思,如何做?P231.2A train travels 60 miles per hour for 3 hours and t How Many Times,How Many Lies 歌词 GRE 猴哥112数学难题, gre数学.124求解答 GRE数学主要考什么?