Answer: 60
Step-by-step explanation:
Given: The ratio of the number of male lions to female lions in the animal reserve = 21:20
The total number of lions reserve=123
Let the number of male lions be 21x and the number of female lions be 20 x.
Now, According to the question, we have
[tex]21x+20x=123\\\\\Rightarrow\ 41x=123\\\\\Rightarrow\ x=\frac{123}{41}\\\\\Rightarrow\ x=3[/tex]
Now, the number of female lions =[tex]20(3)=60[/tex]
Hence, the number of female lions = 60