Alexis has 12 liters of 30% salt solution. To produce a 40% salt solution, how many liters of 80% salt solution does she need to mix in? (Problem Credits: EPGY) (answer without a unit symbol)
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
To produce a 40% salt solution, or 40/100( x+12) where x is the percentage amount of salt solution: Therefore, (80%x) + (30%12)= 40% ( x+12) Solve for x.
0.8x + 3.6=0.4x + 4.8 0.4x= 1.2 x= 3 liters.