LESSON 2
PHARMACOLOGY
2-1.
DEFINITIONS
a. Ratio.
(1)
The relationship of two quantities.
(2)
May be expressed as a:
(a) Ratio
1:8, 1:200
(b) Fraction
1 _1
8, 200
The equality of two ratios
1=3
2 6
2-2.
CROSS MULTIPLYING
A check as to the equality of two ratios can be made by cross multiplying.
a. Multiply the numerator of the first ratio times the denominator of the second
ratio.
b. Then, multiply the denominator of the first ratio times the numerator of the
second ratio.
c. If the ratios are the same or equal, the results of the cross multiplication will
be the same.
EXAMPLE:
1= 3
2 6
1
3
2
6
MD0904
2-2