2.3. Ratio, proportion, and variation
A ratio (:) is the relation between two like numbers. For example, the ratio 5:7 can be written as a fraction, 5/7, or as division 5 ÷ 7. We read the ratio 5:7 as 5 to 7 or 5 per 7.
A ratio can be expressed by a fraction or by a colon (:). So, the ratio of two numbers a and b can be written as a:b which is the same as the fraction , where b ≠ 0.
Reduce the ratio 20:35 to the lowest term.
20:35 = 4/7.
Reduce the ratio ...