The ratio of 1,3 to 1,5 can be written as:
1,3 : 1,5
To simplify this ratio, we can divide both parts by their greatest common divisor, which is 1:
1,3 : 1,5
After simplification, the ratio remains the same:
1,3 : 1,5
Therefore, the ratio of 1,3 to 1,5 is 1,3 : 1,5.
