Saba conducts regular tours of his favorite city in the worl
Saba conducts regular tours of his favorite city in the world, Paris. Each semester he selects among the finest students in the university and escorts them to the City of Lights. In addition to a world-class education on conducting business in Europe, he arranges a number of cultural outings for them to help them immerse themselves in all that France has to offer. He collects an extra $100 from each student for this purpose and limits his tour group to ten lucky individuals. Some of the events (and their prices) he proposes to the students include:
 
 Eiffel Tower visit, $40 per student, E
 Paris Sewer spelunking, $20 per student, S
 Half day passes to the Louvre, $60 per student, L
 Bon Beret tour, $50 per student, B
 
 So much to do and so little time!
Which constraint is most appropriate if the students can choose only three of these activities?
| A. E + S + L + B 4 | |
| B. E + S + L + B 2 | |
| C. $40E + $20S + $60L + $50B $100 | |
| D. E + S + L + B 3 | 
Solution
The third constraint is most appropriate
it limits the total activities to atmost three
if we restrict the students to choose the events so that the total cost does not exceed 100
then they can choose a maximum of two events only as adding of any third event leads
to the total cost more than 100

