Mrs. santos has 24 students in her class. five-eighths of her students have nicknames. mr. russo also has 24 students in his class. only one-third of his students have nicknames. how many students from mrs. santos' class and mr. russo's class do not have nicknames?

In Mrs. Santos' class, five-eighths of the students have nicknames, meaning that three-eighths don't have nicknames. Three-eighths of 24 is 9, so 9 students don't have nicknames.

In Mr. Russo's class, one-third of the students have nicknames, meaning that two-thirds don't have nicknames. Two-thirds of 24 is 16, so 16 students don't have nicknames.

Therefore, there are 9 students from Mrs. Santos' class and 16 students from Mr. Russo's class who don't have nicknames.