52 were asked if they liked salad and tofu. 12 didn't like salad or tofu. 10 like salad and tofu and 13 liked only salad. How many students like only tofu?

Question

I just can't seem to understand how to use venn diagrams for this problem

Answer 1

Eliminating the 12 students that do not like either salad or tofu, you will have 40 students that like either or both.

 

Tofu   |   Tofu & Salad   |   Salad

 

  x               10                   13

 

x + 10 + 13 = 40

 

x = 17 students who only like tofu.