In a math class pf 80 students, 22.5% withdrew from the course prior to the final exam. how many students took the final exam?

Question

In a math class pf 80 students, 22.5% withdrew from the course prior to the final exam. how many students took the final exam?

Answer 1

Percents are just numbers divided by 100, or just move decimal two places left. 

So 22.5% is 22.5/100 or 0.225.   80 students x 0.225 = 18 students withdrew.

leaving 62 remaining. (62 = 80-18)