Question 22856
1)
First convert 3/8 to a decimal. Just divide 3 by 8 to get 0.375.
Next, you need to find out how many times does 0.0125 go into 0.375, so this is a division problem.

{{{(0.375/0.0125) = 30}}}

Answer: You can get thirty 0.0125-grain doses from 3/8 grains of a drug.

2)
If 1000 tablets contain 11.5 grams of an antihistamine, you need to find out how much antihistamine 1 tablet contains.  Do it like this:

(1000 tablets)/1000 = 11.5 grams/1000
1 tablet = 0.0115 grams Now, to find out how much antihistamine is in 475 tablets, do it like this:
1 tablet = 0.0115 grams
475 (1 tablet) = 475(0.0115) grams
475 tablets = 5.4625 grams of antihistamine. 

3) You can use proportions on this problem.

{{{(28mg)/(3ml) = (xmg)/(1.2ml)}}} Solve for x.  Multiply both sides of the equation by 1.2ml
{{{(1.2ml)(28mg)/(3ml) = xmg}}} Do the math.
{{{x = 11.2mg}}}

Answer: The patient would receive 11.2 mg of the drug.