SOLUTION: A chemist needs 90 milliliters of a 78% solution, but has only 43% and 88% solutions available. Find how many milliliters of each should be mixed t oget the desired solution.

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Question 126274: A chemist needs 90 milliliters of a 78% solution, but has only 43% and 88% solutions available. Find how many milliliters of each should be mixed t oget the desired solution.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let x="ml 88%", so 90-x="ml 43%"

{88%)(x)+(43%)(90-x)=(78%)(90) __ .88x+38.7-.43x=70.2 __ .41x=31.5