There are 42 males and 67 females participating in a marathon. What percent of the participants are male?

First, you find the total of both sides.

42 + 67 = 109

Next, you divide the Total by either of the sides, but since we're looking for the percentage of males, it'd be better to do this.

42/109 = 0.39

Multiply it by 100 to change it into percentage form.

0.39 x 100 = 39%

There your answer is 39%