Three out of every 10 students ages 6-14 have a magazine subscription. Suppose there are 30 students in Annabelle's class. About how many will have a magazine subscription?
Assuming the students in Annabelle's class are between 6 and 14 years old, the answer is 9.
Out of every 10 students, 3 have a magazine subscription.
There are three times as many students as this in Annabelle's class, so the answer is calculated by multiplying 3 by 3.
It is assuming that the students in Annabelle's class fit that age.