Ratio

Ratio is the relation between two numbers of same kinds (same kind means same unit/dimension or may be unit less also).

Basic way to find ratio, A has x number of objects and B has y number of object. Then ratio of number of objects A to B =x/y or x:y.

For example, there are 4 boys and 3 girls in the room no 13. Then ratio of boys to the girls is ¾ or 3:4. The ratio is always unit less. For example, David has Nok 1200 and Kari has Nok 1500. Then ratio of money of David to Kari is 1200/1500=4/5 or 4:5. But if they have different currencies, for example Kari has 150 Euro, and then we cannot find the ratio directly. We have to first convert Euro into Nok or Nok into Euro. When both have same unit, we can find the ratio.