15 out of the 20 students at the lunch table had a sandwich. what percent of the table do those 15 students represent? put this in a proportion.

Hello!! So any time a question says "What percent" you can immediately write down the fraction X/100. The proportion would be 15/20= x/100. Then cross multiply to get the equation 1,500=20x. Divide both sides by 20 and x equals 75! Hope this helps!