Sample Questions

1.  Express the following as ratios in fraction form:

a) The dosage for a drug is 45 mg for each kg of body weight

b) A laboratory solution requires 130 mg of NaCl for each litre of solution

c) 1 mL = 1000 µL

d) A biotechnology production process can produce 8 grams of product in each litre of culture

2. Calculate the following unknown proportions:

a) ? / 5 = 2 / 10

b) 0.5 mg / 20 mL = 20 mg / ?

c) ? is to 20 as 30 is to 120

d) 150 is to 5 as 60 is to ?

3. If it requires 1.5 teaspoon of baking soda to make one loaf of bread, how many teaspoons of baking soda are required to make 42 loaves?

4. If a medicine tablet contained 13 mg of an active ingredient, how many tablets are required if you need to administer 52 mg?

5. If there are about 100 blood cells in a 0.01 mL sample, approximately how many blood cells would be in 1.0 mL of this blood?

Access the answers to the Ratios and Proportions Practise Questions (PDF, 100.23 KB) (opens in a new window).