Question

甲、乙两瓶酒精溶液分别重300克和120克~~~~~

Answer 1

甲的浓度=120/300=40%

乙的浓度=90/120=75%

设甲酒精x克,乙酒精y克

x+y=140g

40%x+75%y=50%*140

解得x=100,y=40g