Re: Math 5 tablets with ointment and 6 Advanced Alligation

[Guest guest]

5.) A compounded prescription requires using 10 tablets, which costs $25.00

per 50 tablets and 100 gm of an ointment which costs $9.00 per pound. If there

is a $4.00 dispensing fee, what would the total cost for this prescription?

(answer ($10.89)

Okay let's see if you can do this one with all that I have shown you. Note:

Dispensing or Professional Fee is added AFTER you calculate the cost of the drug

alone.

6.) If 15 grams of a 1% ointment are combined with 30 grams of a 2.5% ointment,

what is the percentage strength of the final product? (answer 2.0%)

Hint: This is an `advanced' alligation instead of grams over ml use X grams

over 100 grams. Use the tutorials to find the directions and give it a try.

8.) In what proportion should 50% alcohol be mixed with 10% alcohol to obtain a

30% alcohol solution? (answer: 1:1)

50-30=20

50-30 = 20 weak

30-10 = 20 strong

20 parts of weak t 20 parts to strong

1 part weak : 1 strong weak

1:1

Hope this helps,

Jeanetta Mastron CPhT BS

Founder/Owner

[Guest guest]

>

>

>

> 5.) A compounded prescription requires using 10 tablets, which costs $25.00

per 50 tablets and 100 gm of an ointment which costs $9.00 per pound. If there

is a $4.00 dispensing fee, what would the total cost for this prescription?

(answer ($10.89)

>

> The answer i got is $10.98 instead of $10.89. Am i correct? Thanks!

[Guest guest]

I could be wrong but I thought that 1lb=453.6g and not 453.6 mg? I know

that the way it was solved makes sense but how do you know when to use

which method be it dimensional analysis or other forms.

Re: Math 5 tablets with ointment and

6 Advanced Alligation

Dear All,

The math problem in my post was a copy and paste from

Message #19185 of 19225 contributed by Issak

(aloyosha ) on Apr 25, 2010 9:50 pm .

I re-posted it asking you all to take a stab at it before I did.

So without actually doing the problem, I awaited someone's reply Which

we got our first reply from edwin d.

Edwin and all this problem should most likely read 100mg, NOT 100gm!

This may contribute to some people not doing the problem. Not sure if

it is a typo in a book or a typo on the post.

In any case this is how you would do the problem BOTH ways!

5.) A compounded prescription requires using 10 tablets, which costs

$25.00 per 50 tablets and 100 mg of an ointment which costs $9.00 per

pound. If there is a $4.00 dispensing fee, what would the total cost

for this prescription? (answer ($10.89)

>

> The answer i got is $10.98 instead of $10.89. Am i correct? Thanks

I too got $10.98, using dimensional analysis and 100 mg:

$25/50 tabs x 10 tabs = $5.00

$9.00/lb x 100 mg = X$

$9.00/454 mg x 100 mg = $1.98

$5.00 + $1.98 + Disp Fee =

$5.00 + $1.98 + $4.00 = $10.98

Using dimensional analysis and 100 gm:

5.) A compounded prescription requires using 10 tablets, which costs

$25.00 per 50 tablets and 100 gm of an ointment which costs $9.00 per

pound. If there is a $4.00 dispensing fee, what would the total cost

for this prescription? (answer ($10.89)

$25/50 tabs x 10 tabs = $5.00

$9.00/lb x 100 gm = X$

$9.00/ 454 mg x 100 gm = X$

$9.00/0.454 gm x 100 gm = $1982.38

or

$9.00/454 mg x 100,000 mg = $1982.38

$5.00 + $1982.38 + Disp Fee =

$5.00 + $1982.38 + $4.00 = $1991.38

I don't really think that a pound of ointment would cost $1991.38, but

I am showing this math for those who did do the problem as written on

the message/post #19185 of 19225 posted/contributed by Issak on

Apr 25, 2010 9:50 pm .

Hope this helps,

Jeanetta Mastron CPhT BS

Founder/Owner

> >

> >

> >

> > 5.) A compounded prescription requires using 10 tablets, which

costs $25.00 per 50 tablets and 100 gm of an ointment which costs $9.00

per pound. If there is a $4.00 dispensing fee, what would the total

cost for this prescription? (answer ($10.89)

> >

> > The answer i got is $10.98 instead of $10.89. Am i correct? Thanks!

>

[Guest guest]

NO! You are Right and I am RED FACED!

I went back to my handwritten notes, knew better, but mechanically transposed

the g and the m, so instead of gm I wrote mg and then proceded to solve for mg.

How sad that with my experience I can still make mistakes, granted not often,

but when I do......

So the original posting by is correct and I shall remove my posting that

may cause people to study incorrectly.

The conversion factor is:

1 lb = 453.5 g

Which can also be rounded to: 454 gm

One can use either ratio/proportion or dimensional analysis to solve. Either way

the 'correct' answer is the same. When ever you can use r/p you could also use

d/a. It is up to you which one you prefer. I usually use R/P, but I felt that I

had been showing that so often that others who use D/A would like to see it. So

I will solve using both.

5.) A compounded prescription requires using 10 tablets, which costs $25.00 per

50 tablets and 100 gm of an ointment which costs $9.00 per pound. If there is a

$4.00 dispensing fee, what would the total cost for this prescription? (answer

($10.89)

$25.00/50 tabs x 10 tabs = $5.00

$9.00/lb x 100 gm = X$

$9.00/ 454 gm x 100 gm = X$

$1.98 = X$

$5.00 + $1.98 + Disp Fee =

$5.00 + $1.98 + $4.00 = $10.98

Ratio/Proportion

$9.00 X $

------ = -------

1 lb 100 gm

$ 9.00 X $

-------- = --------

453.6 100 gm

9.00 x 100

------------- = X $

453.6

$1.98 = X $

Thanks so much for pointing out this error.

thank you for your orignial posting

Edwin thank you for your questioning the answer, to which I concur.

Respectfully to all,

Jeanetta Mastron CPhT BS

Founder/Owner

>

> I could be wrong but I thought that 1lb=453.6g and not 453.6 mg? I know

> that the way it was solved makes sense but how do you know when to use

> which method be it dimensional analysis or other forms.

>

>

[Guest guest]

1 kg = 1000 g

1 kg = 2.2 lb

Therefore

1 lb = 454.45 g

An argument can be made for 1lb = ½ Kg or 500 gm

Whether we used 453.6 or 454 or 454.45 we still get $1.98 which when added to

the problem the final answer is still: $10.98

http://www.convertunits.com/from/lb/to/kg

http://www.fitnessandfreebies.com/conversions.html

http://www.peteducation.com/category.cfm?c=0+1305

Respectfully,

Jeanetta Mastron CPhT BS

Founder/Owner

> >

> > I could be wrong but I thought that 1lb=453.6g and not 453.6 mg? I know

> > that the way it was solved makes sense but how do you know when to use

> > which method be it dimensional analysis or other forms.

> >

> >

>

[Guest guest]

Yes Edwin you are correct!

5.) A compounded prescription requires using 10 tablets, which costs $25.00

per 50 tablets and 100 gm of an ointment which costs $9.00 per pound. If there

is a $4.00 dispensing fee, what would the total cost for this prescription?

(answer ($10.89)

The answer i got is $10.98 instead of $10.89. Am i correct? Thanks!