Mathematics第 25 / 120 题
A solution contains 20 mg per 5 mL. How many milliliters provide 60 mg?
a.10 mL
b.20 mL
c.15 mL
d.12 mL
解析
Use the unit rate of 20 mg in every 5 mL. Because 60 mg is 3 times 20 mg, you need 3 x 5 = 15 mL.
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