Acompany uses two vans to transport workers from a free parking lot to the workplace between 7: 00 and 9: 00 am . one van has 6 more seats than the other. the smaller van makes two trips every morning while the larger one makes only one trip. the two vans can transport 57 people , maximum. let x be the seats in the small van and y the seats in the large van . how many seats does the larger van have?