(should be an easy word problem) the senior classes at high school a and highschool b planned separate trips to the county fair. the senior class at highschool a rented and filled 3 vans and 4 buses with 153 students. High school b rented and filled 7 vans and 8 buses with 321 students. each can and each bus carried the same humber of students. how many student can a van carry? how many students can a bus carry?