SOLUTION: a pharmacist wishes to prepare 200ml of 8% solution, but has only a 10% solution and a 2% solution to mix together. how much of each solution should she use ?

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Question 347647: a pharmacist wishes to prepare 200ml of 8% solution, but has only a 10% solution and a 2% solution to mix together. how much of each solution should she use ?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 10% solution.
Let B be the amount of 2%solution.
.
.
Volume equation:
1.A%2BB=200
Concentration equation:
10A%2B2B=8%28200%29=1600
2.5A%2BB=800
Subtract eq. 1 from eq. 2,
5A%2BB-A-B=800-200
4A=600
highlight%28A=150%29ml
Then from eq. 1,
150%2BB=200
highlight%28B=50%29ml