During a break, 130 students have gone to the canteen to buy cakes and coke. 80 students bought cake and 57 students bought coke. If every student has purchased at least one thing, find the number of students who have purchased both.

During a break, 130 students have gone to the canteen to buy cakes and

1.	During a break, 130 students have gone to the canteen to buy cakes and coke. 80 students bought cake and 57 students bought coke. If every student has purchased at least one thing, find the number of students who have purchased both.
A.	7
B.	15
C.	17
D.	12
Answer» B. 15