85 students went of a field trip. three buses were filled and 25 students traveled in cars. how many students were in each bus?

Someone i beg of you me with this : isabella wants to use dragons and unicorns by giving them joke books. she wants to amuse a total of at least 14 dragons and unicorns (condition a), with 108 joke books at most (condition b). the graph represents the constraints on the number of dragons d and unicorns u isabella amuses. isabella amuses 2 dragons. how many unicorns can she amuse to meet both her constraints? a.) exactly 15 unicorns b.) isabella doesn’t have enough joke booked left to amuse any unicorns c.) at least 14 unicorns and at most 18 unicorns d.6 at lest 12 unicorns and at most 15 unicorns