Question

A college survey was taken to determine where students study. Of 132 students​ surveyed, 78 studied in the cafeteria​, 64 studied in the student lounge​, 22 studied in both the cafeteria and the student lounge.
Of those interviewed how many studied only in the cafeteria ​?

Answer 1

surely that would be 78-22 = 56, right?

Answer 2

Thanks, I already did this one but I do think that was the answer