Amath class has a total of 31 students. the number of males is 15 more than the number of females. how many males and how many females are in the class?

Let the number of females =  x. This means the number of males in the class is x+15.

Put the two together to get x + (x+15) = 31. Simplify to 2x + 15 = 31. Subtract 15 on both sides to get 2x = 16. Divide by 2 on both sides to isolate the x to get x = 8.

There are 8 females in the class meaning there are 23 males in the class. 

Iwould say d but i am not 100% positive