Jack is looking to purchase a new video game. He finds a 25% off coupon for a store that sells the video game he wants. If the original price of the video game is $65, how much will Jack pay after the discount?(do not worry about sales tax) PLEASE HELP ME!!!

"This" refers to the 65 students who walk. "Is" can be written with an equal sign. 12.5% means 12.5/100 which is 0.125. "Of" in word problems means multiplication. We're trying to find the total number of students so we'll call this x.

Equation:
65=0.125x
Divide both sides by 0.125.
520=x
There are 520 students.