The year of 1995 has the lowest population of females elephants (100 females). The population of 100 female elephants contains both the tusk and the tuskless females. The percentage of tuskless female elephants in the same year was 40%. Therefore, the number of female elephants without tusk can be calculated by using the following formula or method:
Let x be the total number of elephants.
∴ The number of tuskless females = [tex]\frac{x\times40}{100} = x \times 0.4[/tex] = 40
Hence, the answer is the option C.
