Answer:a - number of students in each van
b - number of students in each bus
8a+8b=240
4a+b=54 => b=54-4a
8a+8(54-4a)=240
8a+432-32a=240
432-240=32a-8a
192=24a
a=192/24=8 students in each van
b=54-4*8=54-32=22 students in each bus
1.6m questions
2.0m answers