A ratio is a relationship between two numbers indicating how many times the first number contains the second. For example, if a bowl of fruit contains eight oranges and six lemons, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3).
In other words, a ratio says how much of one thing there is compared to another thing. There are 3 blue squares to 1 yellow square