Definition of ratio

If a and b are two quantities with the same units such that ; then

Ratio does not have any unit.

The quantities a and b are called terms of the ratio.

a' is called antecedent (first term)

b' is called consequent (second term)

Note:

A ratio is always expressed in its lowest terms.

Examples:

a) Ratio of 20 boys to 15 girls.

Ratio of boys to girls =4:3

b) Ratio of Rs.50 to Rs.75

c) Ratio of 4m to 160cm

Note:

The value of a ratio remains the same if both the antecedent and the consequent are multiplied or divided by the same non-zero quantity.