Welcome! You are encouraged to register with the site and login (for free). When you register, you support the site and your question history is saved.
Review: Students per Class
Explanation
In some questions we have a constant ratio that we work
with. In this case, the ratio changes, and the number of classes changes, but
the total number of students stays the same. Focusing on the units, we can
write
On the left, both the ratio and the number of classes are
integers, since we are not dealing with fractional students or classes. So,
looking at the answer choices, we could be talking about 3 students per class
and 40 classes, 4 students per class and 30 classes, and so on. Actually, there
we have our answer: if we increase the students per class from 3 to 4, the
number of classes decreases from 40 to 30, just as the question indicates. So
the current ratio is 3.
The correct answer is (A).
If you believe you have found an error in this question or explanation, please contact us and include the question title or URL in your message.