How many were in the busses and how many were in the van?

Question

385 Students go on a field trip. There are 19 vehicles, some vans and some buses. 

7 students can fit in a van, and 25 students can fit in a bus.

Answer 1

7V + 25B = 385

V+B = 19

V=19-B

7(19-B) + 25B = 385

133 - 7B +25B = 385

18B = 385-133 = 252

B = 252/18 =14 buses = 25x14 = 350 students in buses

V =19-B = 5 vans = 35 students total in vans

7(5) + 25(14) = 35 + 350 = 385