A company uses two vans to transport workers from a free parkinglot to the workp

A company uses two vans to transport workers from a free parkinglot to the workplace between 7:00 and 9:00 a.m. One van has 6 moreseats than the other. The smaller van makes two trips every mornigwhile the larger one makes only one trip. The two vans cantransport 57 people maximum. How many seats does the larger vanhave?