SOLUTION: An explosive specialist must make a solution that is 21% Nitro glycerine. He has 7 ml of a 15% solution. How many ml of a 24% solution must he mix with all of the 15% solution to g

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Question 984585: An explosive specialist must make a solution that is 21% Nitro glycerine. He has 7 ml of a 15% solution. How many ml of a 24% solution must he mix with all of the 15% solution to get the desired 21% solution?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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An explosive specialist must make a solution that is 21% Nitro glycerine.
He has 7 ml of a 15% solution.
How many ml of a 24% solution must he mix with all of the 15% solution to get the desired 21% solution?
:
let x = amt of 24% solution required
:
write an equation that is the decimal equiv of the percent nitro
.15(7) + .24x = .21(x+7)
1.05 + .24x = .21x + 1.47
.24x - .21x = 1.47 - 1.05
.03x = .42
x = .42/.03
x = 14 ml of 24% solution required