If you have 1000 mls of stock that contains 50 units of drug in 1000 ml, and you want to calculate how to deliver 7 units per hour (you question wasn't all that clear, but we'll assume that's it.), then..
7 U/hr x 1000 ml/50 U = 140 ml/hour for 7 hours.
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Dimensional analysis.
Dimensional analysis
It depends what it is 1000g of. If it's water (what the SI units are based on), then no, because 1000g of water is 1000ml.
Area = 15*18 = 270 square units of measurement
3/5 x 50 = 30 There are five equal parts of ten units in 50. 3 of those parts equals 30.