Question

For a class trip, the teachers would like to have one adult for every ten students. There are 190 students on the trip. How many adults should go on the trip?

Answer 1

You can solve this problem with the following 

$\frac{1}{10} = \frac{a}{190}$
$10a = 190$
$a = 19$

There should be 19 adults on the trip.