Alligation Calculations (Medial)

Question 1

Define alligation

Answer 1

Alligation is an arithmetical method of solving problems that involves the mixing of a common ingredient when present in different strengths.

Question 2

Types of alligation

Answer 2

1) Alligation medial
2) Alligation alternate

Question 3

Alligation medial

Answer 3

used to determine the strength of a common ingredient in a mixture of two or more preparations.

Question 4

What is the percentage strength (v/v) of alcohol in a mixture of 300 mL of 40% v/v alcohol, 200 mL of 60% v/v alcohol?

Answer 4

48%

Question 5

What is the percentage of zinc oxide in an ointment prepared by mixing 200g of 10% ointment, 50g of 20% ointment and 100g of 5% ointment?

Answer 5

10%

Question 6

What is the percentage strength of alcohol in a mixture of 500mL of 40% v/v alcohol, 400mL of 21% v/v alcohol and 100mL of plain water?

Answer 6

28.4%

Question 7

What is the percentage strength of alcohol in a mixture of 500ml of 45% v/v alcohol, 500ml of 25% v/v alcohol and 1 liter of pure alcohol?

Answer 7

67.5%