Please help: Math question..getting anxious..

[Butterflybee]

Here is the question:

Child weighs 30kg, what is the hourly flow rate in mL? The answer is supposedly 71.

Ive been studying like forever came to this question. Knowing how to do this is probably someplace in the crevices of my mind but I cant figure it out. It's probably real easy to. Im just too whatever to get it right.

It is literally days before I test. I feel like crying and sick. I want/need this so much. Anytime anyone talks to me about this NCLEX, I feel like crying. Is anyone else like this? Talking about this NCLEX makes me really sweat. My thoughts/feelings go from confidence to absolutely no confidence especially when I cannot even figure out an easy question like this one.

[jadu1106]

hi~

is there part of the question missing? there is not enough info for me to try and figure the ml/hr for this question.

[suzanne4, RN]

You are definitely leaving out a significant part of the question. One cannot calculate a rate with only the weight of the patient.

Normally, you are given the weight of the child as well as the amount of fluid that they want per kg of body weight. Or you are given specifics as to what you are to be using to calculate this such as what is wrong with the child. Trauma or just routine maintenance?

[Butterflybee]

Here is the question:

Child weighs 30kg, what is the hourly flow rate in mL? The answer is supposedly 71.

Actually Im not leaving anything out because there are constants: 24 hours in a day and 60 minutes in an hour.

I calculated it this way :

30ml times 60 minutes equal 1800, then I divided 1800 by 24 hours but this gave me 75 (but the answer is supposedly 71).

They 'Lippincott- PN' page 368 gave this as the way to do it: A Formula::

100ml/kg for the first 10 kg then

500ml/kg for the next 10 kg then

20 ml/kg for each kg above 20

then add. It looks like this:

100 (10) = 1000 ml per day

50(10)= 500ml per day

20(10) =200 ml per day

(those tens are a breakdown of the number given which is thirty)

THEN add

100 + 500+ 200=1700 ml/day

Finally

1700 divided by 24 = 71

I just thought there might be another shorter way. Not sure if the way I did it was or would be considered correct. I decided to just study their way to make sure. If anyone can figure another way other than Lippincotts, I would love to hear.

Suzanne I considered the way you said and you are correct when it applies to a solution not with weight or so says the book. This was why I found it so unusual.