18.3: elevator constraints
an elevator car in a skyscraper can hold at most 15 people for safety reasons, each car
can carry a maximum of 1,500 kg, on average, an adult weighs 70 kg and a child weighs 15
assume that each person carries 4 kg of gear with them.
1. write as many equations and inequalities as you can think of to represent the
constraints in this situation. be sure to specify the meaning of any letters that you
use (avoid using the letters z, m or g.)