Question

How to calculate the sex ratio.
20 female and 25 male.

Answer 1

The sex ratio is the ratio of males to females in a population. In most sexually reproducing species, the ratio tends to be 1:1. This tendency is explained by Fisher's principle. ... As of 2014, the global sex ratioat birth is estimated at 107 boys to 100 girls (1000 boys per 934 girls).

Answer 2

sex ratio properties of males relatives to female in a population
Gornal formula - NUMBER OF MALES
NUMBERS OF FEMALES ×100