exam Maths Puzzle Numerical Ability

3x+7y=z,
subject to: 4x+y>/4
-x+y>/1
x>0,y>0

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calculate the medical dosage. given that a medicine bottle contains 15 milligrams (.015 grams) of tylenol for each 10ml of saline solution in which it is disolved.Grandpa jones who Jason is a salesperson in the electronics department. He is 25% short of his goal for the week. His goal is to earn 448. for each CD player he sells he earns 56.00. how many CD players does he need to sell in order to meet his goal?