Well, might as well practice on this.
I cannot draw the Venn diagrams here, because I don't know how to draw by computer.
There's the rectangular box with the 3 rings or circles inside the box. You should know them, if you studied Venn diagrams.
The central space, the space where all 3 languages have a common space, there will be 3 students there.
The space common to Latin and French, there will be 2 students.
The space common to Latin and Spanish, there will be 1 student.
Only Latin, 5 students.
Only Spanish, 8 students.
Common to Spanish and French, 4 students.
Therefore, only French, 7 students --------------answer.