Give me a solution!
Level
pending
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)
The answer is 3.
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1 solution
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.