# Calculations-6

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The Pharmacy Technician Workbook & Certification Review Ch 6

0.625

0.002

0.25

0.66

0.12

0.425

0.032

70%

75%

150%

12.5%

7.5%

80%

2.5%

LXVII

XXIX

LXXI

CVIII

VIII

XCVIII

IX

40

42

3.5

2400mg

### A prescription calls for 200mg of a drug that you have in 10mg/15ml concentration. How many ml of the liquid do you need?

10mg/15ml=200mg/x
10mg(x)=15ml(200mg)
x=300ml

19

103

1900

2.5

30

59

### An IV requires the addition of 40 mEq potassium chloride (KCL). You have a vial of KCL at a concentration of 20mEq per 10ml. How many ml should be added?

20mg/10ml=40mg/x
20mg(x)=10ml(40mg)
x=20ml

### If 200 grams of dextrose is ordered using a 50% dextrose solution, how many ml are needed?

50%=50g/100ml
50g/100ml=200g/x
50g(x)=100ml(200g)
x=400ml

### A prescription calls for 0.36mg of a drug that you have in 50mcg/ml concentration. How many ml do you need?

0.36mg=360mcg
50mcg/1ml=360mcg/x
50mcg(x)=360mcg(1ml)
x=7.2ml

### The infusion rate of an IV is 300ml over 5 hours. What is the ml/minute rate?

300ml/5h=60min/x
300ml(x)=5h(60min)
x=1ml/min

x=1.4

### An IV calls for administration of 1.5ml/minute of a solution for four hours. How much solution will be needed?

1.5ml/min=x/240min
1.5ml(240min)=x(1min)
x=360ml

### If a physician orders 25% dextrose 1000ml and all you have is 70% dextrose 1000ml, how much 70% dextrose and how much sterile water will be used?

70%-25%=45 parts water
25%-0%=25 parts 70% dextrose
45+25=70 parts total
25/70 x 1000ml= 357ml 70% dextrose
45/70 x 1000ml=643ml sterile water

### If a physician orders 20% dextrose 1000ml and all you have is 70% dextrose 1000ml, how much 70% dextrose and how much sterile water will be used?

70%-20%=50 parts water
20%-0%=20 parts 70% dextrose
50+20=70 parts total
20/70 x 1000ml=286ml 70% dextrose
50/70 x 1000ml=714ml sterile water

### If a physician orders 25% dextrose 500ml and you have 50% dextrose 1000ml, how much 50% dextrose and how much sterile water do you need?

50%-25%=25 parts water
25%-0%=25 parts 50% dextrose
25+25=50 parts total
25/50 x 500ml=250ml 50% dextrose
25/50 x 500ml= 250ml sterile water

Example: