## 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

 Jul 16, 2011 Real truth... by: Anonymous How many problems like these are actually onthe certification exam ?

 Jun 27, 2011 My Set up for Proportions Math by: SilverWolf 1st. convert 1L to 1000mLThis is how I set it up100,000 units 50mL_____________ = __________1000mL X units100,000 units x 50mL = 5,000,0001000 ÷ 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 unitsB. 500 unitsC. 5,000 unitsD. 50,000 units"For every ONE Liter, you have 100,000 units of heparin.So you convert:1L = 1000mLTherefore your setup is:100,000 units/1000mL = x units/50mLyou cross multiply: 100,000 units x 50mL = 1000xSolve 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/ml100units 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 = 100,000/1x = .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/1000mlCross multiply and solve for X.

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