In an excursion of 80 students at Ocean Park Manila, students bought sandwiches, drinks and chocolates as follows:
50 students bought sandwiches
30 students bought drinks
30 students bought chocolates
18 Students bought chocolates and drinks
15 students bought sandwiches and chocolates
8 students bought drinks and sandwiches
5 students bought chocolates, drinks and sandwiches

How many students did not buy any of the 3 kinds?

A group of 100 workers were asked if they graduated college, and if they belonged to a Union. Sixty were not college
graduates, 20 were non-union college graduates, and 30 were union members. How many of the workers were neither
graduates nor union members?

There are 100 athletes and 3 different seasons when sports are offered: soccer in the fall, basketball in the winter, and
baseball in the spring. Some of the athletes play only one sport, some play two sports, and some play all three. Forty
people play soccer. If 15 play all 3 sports, 5 play basketball and soccer but not baseball, and 10 play soccer only, how
many people play both baseball and soccer?

You can answer any of the three