Question

How much water must be added to 12 L of a 40% solution of alcohol to obtain a 30% solution?

A. .5 L
B. 5 L
C. .4 L
D. 4 L

Answer 1

Let x = amount of water to add
0x + .40(12)=.30(12+x)

Answer 2

4 L

Answer 3

Thank you everyone :D

Answer 4

yw

Answer 5

anybody giving answers only will be reported

Answer 6

Are you the answer police?

Answer 7

Something like that. You have to understand that I was the person who created and proposed the current code of conduct

Answer 8

reported to who

Answer 9

To all of the mods and admin

Answer 10

asker doesnot say that explain or step by step

Answer 11

That doesn't matter anymore. Here's what does matter:

http://openstudy.com/code-of-conduct

Answer 12

@cinar

Answer 13

whatever..