Pharmacy Tech Study

frustrated with proportions math

by Mona
(Portland, OR)

I feel like the answer is right in my face. I know this is a proportion question. But why is my answer coming out either, 20, or 2000?

How many units of heparin are in 50mL of a 100,000 units/L solution?

A. 50 units
B. 500 units
C. 5,000 units
D. 50,000 units

I feel so stupid because this is so easy.

Comments for
frustrated with proportions math

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Jul 16, 2011

Real truth...
by: Anonymous

How many problems like these are actually on
the certification exam ?

Jun 27, 2011

My Set up for Proportions Math
by: SilverWolf

1st. convert 1L to 1000mL

This is how I set it up

100,000 units 50mL
_____________ = __________

1000mL X units

100,000 units x 50mL = 5,000,000
1000 ÷ 5,000,000 = 5,000

Apr 07, 2011

The answer is C. 5,000 units
by: Anon

"How many units of heparin are in 50mL of a 100,000 units/L solution?

A. 50 units
B. 500 units
C. 5,000 units
D. 50,000 units"

For every ONE Liter, you have 100,000 units of heparin.

So you convert:
1L = 1000mL

Therefore your setup is:

100,000 units/1000mL = x units/50mL

you cross multiply: 100,000 units x 50mL = 1000x

Solve for x, and get x = 5,000 units.

- - - - -

Proportions can be really annoying.

Mar 27, 2011

frustrated with proportions math
by: Anonymous

Thanks, I saw my mistake.

Mar 27, 2011

The answer is 5,000 units
by: Anonymous

100,000/1000ml=100units/ml

100units per ml x by 50ml

Mar 26, 2011

frustrated with proportions math
by: Anonymous

Which solution is correct? 5,000 or 50,000?

Mar 26, 2011

I got 5000 too
by: Sarah

I converted ml to L first, and came up with .05L, then set it up as a proportion.

x/.05 = 100,000/1
x = .05(100,000)
x = 5000 units

Mar 23, 2011

I got 5000
by: Anonymous

If theres 100000 units in a liter, divide by 1000 and you get 100 per ml. Multiply by 50 from there and you get 5000 units total

Mar 22, 2011

unit in ml question
by: Anonymous

Is the answer 50,000 units?

This the equation I set up:

x/50ml = 1000000units/1000ml

Cross multiply and solve for X.

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