Using the percentage concept, it is found that 62.5% of the total number of students are in the outdoor club.
The percentage of an amount a over a total amount b is given by a multiplied by 100% and divided by b, that is:
[tex]P = \frac{a}{b} \times 100\%[/tex]
In this problem:
Thus:
[tex]P = \frac{40}{64} \times 100\% = 62.5\%[/tex]
62.5% of the total number of students are in the outdoor club.
More can be learned about percentages at https://brainly.com/question/10491646