Question

For a class trip the teacher would like to have one adult for every 10 students there are 190 students on the trip how many adults should go on the trip

Answer 1

You should do:

190÷10=19

that is 19 adults.

check is to do the inverse:
19×10=190

Answer 2

about 19 adults.
you have to divide 190 by 10 and you should get your answer.