Question 1182912
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As stated in the post,  the problem is  AMBIGOUS,  since the doctor's instruction does not say  "keep the usual proportion of medications".



I'd say it is the doctor's mistake/negligence to formulate his or her prescription/instruction in this way.



Ok,  I have nothing against the doctor :)   Consider it as my notice to the problem's creator.



How this problem's creator formulates the problem,  he / (or she) transforms and presents Math problem as a  BAD  STYLE  puzzle.