Alligation Calculations (Alternate)

Question 1

Define alligation alternate

Answer 1

Alligation alternate: This is a method by which we may calculate the number of parts of two or more components of a given strength when they are to be mixed to prepare a mixture of desired strength.

Question 2

Prepare 500ml of 48% alcohol by using 40% alcohol and 60%
alcohol.

Answer 2

[60%][ ][8]
[ ][48%][ ]
[40%][ ][12]

60% –> 8
40% –> 12
60%:40%
8:12
2:3
500/5 = 100
60% –> 2×100 = 200mL
40% –> 3×100 = 300mL

Question 3

A hospital pharmacist wants to use three lots of
zinc oxide ointment containing, respectively, 50%, 20%, and 5% of zinc oxide. In what proportion should they be mixed to prepare a 10% zinc oxide ointment?

Answer 3

Final ans.
50% : 20% : 5%
1:1:10
For the steps refer to alligation alternate PowerPoint
Slide no. 27

Question 4

In what proportion may a manufacturing pharmacist mix 20%, 15%, 5%, and 3% zinc oxide ointments to produce a 10% ointment?

Answer 4

Final answer
5 parts of 20%
7 parts of 15%
10 parts of 5%
5 parts of 3%
For steps refer to the alligation alternate PowerPoint
Slide no. 28-29