Final answer:
By subtracting the number of children who rode in cars from the total and then dividing by the number of buses, we find that there were 35 children on each of the 7 buses.
Step-by-step explanation:
To determine how many children were on each bus during a preschool field trip, we must first subtract the number of children who rode in cars from the total number of children on the trip.
In this case, there were 258 children altogether and 13 children rode in cars. So, we subtract 13 from 258, giving us 245 children who rode on the buses.
Next, we divide the number of children who rode on buses by the number of buses. There were 7 buses, so we divide 245 children by 7 buses to find out how many children were on each bus.
Doing the division, 245 ÷ 7 = 35, so there were 35 children on each bus.