Answer:
The ratio of red to blue squares in the given set of 2 reds and 18 blues can be written as:
Red:Blue = 2:18
To simplify the ratio, we can divide both the numerator and denominator by the greatest common factor (GCF) of 2 and 18, which is 2. Dividing both terms by 2, we get:
Red:Blue = 1:9
Therefore, the ratio of red to blue squares in its simplest form is 1:9.