SOLUTION: How much 20%for solution needs to be added to 60% solution to make 400ml of a 40% solution?

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: How much 20%for solution needs to be added to 60% solution to make 400ml of a 40% solution?      Log On


   

Question 520456: How much 20%for solution needs to be added to 60% solution to make 400ml of a 40% solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How much 20%for solution needs to be added to 60% solution to make 400ml of a 40% solution?
---
Equation:
active + active = active
0.20x + 0.60(400-x) = 0.40*400
---
Multiply thru by 100:
20x + 60*400 - 60x = 40*400
-40x = -20*400
x = 200 ml (amt. of 20% solution needed)
400-x = 200 ml (amt. of 60% solution needed)
============================================
Cheers,
Stan H.
===========