To find the ratio of blue birds to the total number of birds in the pet shop, we need to use the fraction 15/45 and simplify it to 1/3.
To find the ratio of blue birds to the total number of birds, we need to find the fraction that represents the number of blue birds out of the total number of birds. Let's say there are 15 blue birds and a total of 45 birds in the pet shop.
The ratio of blue birds to the total number of birds would be 15/45.
To simplify this fraction, we can divide both the numerator and denominator by the greatest common factor, which is 15. Dividing 15 by 15 gives 1, and dividing 45 by 15 gives 3. Therefore, the simplified fraction would be 1/3.