SOLUTION: A certain drug is made from only two ingredients: compound A and compound B. There are 4 milliliters of compound A used for every 5 milliliters of compound B. If a chemist wants to

Question 1166070: A certain drug is made from only two ingredients: compound A and compound B. There are 4 milliliters of compound A used for every 5 milliliters of compound B. If a chemist wants to make 612 milliliters of the drug, how many milliliters of compound A are needed?
Answer by htmentor(1343) (Show Source): You can put this solution on YOUR website!
The ratio of A to B is 4 to 5: A/B = 4/5
Thus A = (4/5)B
A + B = 612 -> (4/5)B + B = 612
B = (5/9)612 = 340 ml
Hence A = (4/5)340 = 272 ml

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