Question 1197959

For a charter bus, students must pay $30 each if 28 students go on the trip. If only 21 students sign up for the trip, how much would each have to pay if the total cost is the same?
<pre>Total cost: 28($30)
Cost for each of 21 students: {{{highlight_green(matrix(1,7, 28(30)/21, "=", 4(30)/3, "=", 4(10), "=", highlight("$40")))}}}
That's ALL!!</pre>