Help with math practice

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Can someone please help me work out these questions thanks!

Jason, a 5 yr old has returned from the recovery room with an IV of D5 1/2 NS infusing at 42 ml/hr. the nurse checks the IV site and bag. notes there is 850 ml of IV fluid remaining. if the physician's order states " continue present IV fluids/rate until bag is finished" how long will the IV hang?

Answer: 20 hours and 14 min

Ryan's insulin is being titrated. he has a liter bag of D5 1/4 NS with 500 units of regular insulin on an infusion pump. based on his accucheck, the physician ordered the dosage to be 8 units per hour. what rate will the nurse set on the pump?

Answer: 16

Enid has a primary IV infusing at 30 ml hr. she receives an antibiotic q 4 hr in 15ml fluid over 30 min with each dose. the primary is stopped while the med is infusing but not while the flush of 3 ml is given each time. what is her daily intake of IV fluids:

Answer: 738 ml

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1. hrs = mL ÷ mL/hr

2. mL/hr = mL/units x units/hr

3. mL = (mL/hr * 24hrs) + (antibiotic mL * 6) + (flush mL * 6) - (mL/hr * ((30*6)/60))

mL = (mL/hr * 24hrs) + (antibiotic mL * 6) + (flush mL * 6) - (mL/hr * ((30MINUTES PRIMARY IS NOT INFUSING*6NUMBER OF TIMES PRIMARY IS NOT INFUSING)/60TO CONVERT TO TOTAL NUMBER OF HOURS))

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