SOLUTION: how many liters of 40% acid should be combined with a 20 liter mixture that is 15% acid in order to produce a mixture that is 25% acid? use X= amount of 40% acid to add. show the e

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Question 762279: how many liters of 40% acid should be combined with a 20 liter mixture that is 15% acid in order to produce a mixture that is 25% acid? use X= amount of 40% acid to add. show the equation that comes from this problem.
I got (.4x+3)/(x+20)=.25
is this correct?
is the number of liters you need for the 40% acid: 6.6667 ?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
{Amount of pure acid} / {Amount volume of mixture} = {Concentration of the acid}

%2840%2Ax%2B15%2A20%29%2F%28x%2B20%29=25 and your equation is also good.

You asked if your resulting answer is good. TEST it in your equation! If you find equality, then your number result is correct, otherwise not.

Working a solution for x from YOUR equation:
0.4x%2B3=0.25%28x%2B20%29
0.4x%2B3=0.25x%2B5.0
%280.4-0.25%29x=5
0.15x=5
x=5%2F0.15
highlight%28x=33%261%2F3%29