will give medal and a fan soo plz help!!

In a chemistry lab, a student is mixing together two solutions that contain alcohol. One solution is 12% alcohol and the other is 40% alcohol. She uses 300ml of the 12% solution. How many ml of the 40% solution does she use if the resulting mixture is a 28% alcohol solution?

Question

will give medal and a fan soo plz help!!


In a chemistry lab, a student is mixing together two solutions that contain alcohol. One solution is 12% alcohol and the other is 40% alcohol. She uses 300ml of the 12% solution. How many ml of the 40% solution does she use if the resulting mixture is a 28% alcohol solution?

anonymous · Answer

My chemistry is rusty, and I would suggest that if you get no replies here, you head on over to the chemistry section.  I will look it up to maybe jog my memory

anonymous · Answer

thnks

anonymous · Answer

I do not know this on a level enough to be able to explain it to you on a full comprehensive level. However, I do have an answer, would it be okay if I show you my work and you can perhaps see if it helps you out?

anonymous · Answer

yes plis

anonymous · Answer

$$.12(300)+.4x=.28(300+x)$$
$$36+.4x = 84+.28x$$
$$.12x = 48$$
$$x= 400$$