Jan won 51.9% of the votes in the race for school secretary. She received 415 votes. About how many students are in the school?

Mental way:

415 / 51.9 * 100 = 800 students in the school.

detailed way:

x is the amount of students in the school.

51.9% * x = 415

(divide both sides by 51.9% (or 0.519))

x = 800 students