Maths problems some one help

[Retrospect]

Hi guys well i having a little trouble with my maths well mainly on these two questions

Prepare a dosage if 0.6mg from an available strength of 1000 mcg per 2ml

I calculated it and got 1.2 mls i think that its right but unsure

and mainly this question

A dosage of 200mcg is ordered. the strength available is 0.3mg in 1.5ml. Determine the required dosage in ml.

Well this is my working out but then i got stuck

200 mcg 4 2

----- cancel then divide the numbers and got ----- cancel = ---

300 mcg (i converted the 0.3 mg) 6 3

then place them in the formula

2 1.5

-- x --- = then i just don't know how to do it i multiplied it and got 10

3 1 but that doesn't seem right....

any help is greatly appreciated:)

[RedhairedNurse, BSN, RN]

This is what I got

1) 1.2 mL

2) 1 mL

[RedhairedNurse, BSN, RN]

trying to put it in dimensional anaylsis form, hope you understand

200 mcg------1 mg ----------1.5mL

________________________________= 1 ml

----0------- 1000mcg ------0.3 mg

okay, the mcg cancel out each other, the mg cancel out each other, now you are left mL

mulitiply all the way across on each line, then divide

[locolorenzo22, BSN, RN]

ok so if 1mg=1000mcg. Then 0.6 mg=600mcg. dose desired(600mcg) divided by dosage 1000mcg * 2mL= 1.2ml.

hope that helps.

[cubangirl]

Hi guys well i having a little trouble with my maths well mainly on these two questions

Prepare a dosage if 0.6mg from an available strength of 1000 mcg per 2ml

I calculated it and got 1.2 mls i think that its right but unsure

and mainly this question

A dosage of 200mcg is ordered. the strength available is 0.3mg in 1.5ml. Determine the required dosage in ml.

Well this is my working out but then i got stuck

200 mcg 4 2

----- cancel then divide the numbers and got ----- cancel = ---

300 mcg (i converted the 0.3 mg) 6 3

then place them in the formula

2 1.5

-- x --- = then i just don't know how to do it i multiplied it and got 10

3 1 but that doesn't seem right....

any help is greatly appreciated:)

Do not go crazy with math, this is what i do:

I write what they want, is this case is

200mcg, convert them to mg= 0.2mg. then what i actually have 0.3mg in 1.5ml, so:

0.2 0.3

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

x 1.5

the program is not letting me write the ratio proportion equation the right way. so is 0.2 over x then the equal sign and 0.3 over 1.5

after this you only have to cross multiply

0.3x= 0.2 times 1.5

0.3x = 0.3 divide this and you get 1 wich is the answer.

Hope this helps!!! i always use ratio proportion and always get the right answer. Good luck.