SOLUTION: A tank holds 40 liters of a chemical solution. Currently, the solution has a strength of 10%. How much of this should be drained and replaced with 50% solution to get a final stren

Question 785670: A tank holds 40 liters of a chemical solution. Currently, the solution has a strength of 10%. How much of this should be drained and replaced with 50% solution to get a final strength of 30%?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A tank holds 40 liters of a chemical solution. Currently, the solution has a strength of 10%. How much of this should be drained and replaced with 50% solution to get a final strength of 30%?
-----------
Equation:
active-active + active = active
0.10*40 - 0.10x + 0.50x = 0.30*40
--------
10*40 - 10x + 50x = 30*40
40x = 20*40
---
x = 20 liters (amt. to be removed and replaced)
=====================
Cheers,
Stan H.
====================
RELATED QUESTIONS
A tank holds 140 liters of a chemical solution. Currently, the solution has a strength... (answered by stanbon)

A tank holds 80 liters of a chemical solution. Currently, the solution has a strength of... (answered by ptaylor)

a tank holds 80 liters of a chemical solution. Currently, the solution has a strength of... (answered by josmiceli)

A tank holds 80 liters of a chemical solution. Currently, the solution has a strength of... (answered by josgarithmetic)

A tank holds 80 liters of chemical solution. Currently, the solution has a strength of... (answered by Boreal)

A tank holds 100 liters of a chemical solution. Currently, the solution has a strength of (answered by lwsshak3)

A tank holds 80 gallons of chemical solution. Currently the solution has a strength of... (answered by josmiceli)

Please help A tank holds 30 liters of a chemical solution. Currently, the solution has (answered by stanbon)

A tank holds 140 liters of checmical solution. Currently the solution has a strength of... (answered by josmiceli)