The 3 it is the one the bottom left corner
Not really sure whats up with that inequality but she can't, if she has to spend 1.5 hours in a lab that leaves her with 5 hours. 5/4 is 1.25, so no, she can only spend 1.25 hours with each student.
285.
60 x 4 = 240.
add 45 = 285.
The ratio in simplest form is 2:5
