Algebra-1

In the given problem, we are told that there are 5 students for every 2 teachers in the original scenario. We want to maintain the same ratio when the number of students increases to 20. To determine the number of teachers needed, we can set up a proportion using the ratios:

Original ratio: 5 students / 2 teachers

New ratio: 20 students / x teachers (where x represents the number of teachers)

Setting up the proportion, we have:
5/2 = 20/x

Therefore, the correct answer is a.

Click "Show Answer" to reveal the answer and analysis