Yellowstone national park is a popular field trip destination. this year the senior class at high school a and the senior class at high school b both planned trips there. the senior class at high schoola rented and filled 6 vans and 3 buses with 168 students. high school b rented and filled 6vans and 6 buses with 264 students. each van and bus carried the same number of students. how many students can a van carry? how many students a bus can carry?