On a random Friday, 90% of students are present in Mrs. Kosmowski’s math class during the day. If she sees 80 students that day, how many students are in class?

Answer 1

On a random Friday, 90% of students are present in Mrs. Kosmowski’s math class during the day. If she sees 80 students that day, how many students are in class?

Let S = Number of students in class.....so.....

.90 (90%) x S = 80

.9S = 80

S = 80/.9 = 89....this value is approximate. 90% of some number S that gives you 80 is not a whole number. So the closest number that gives you a 80 students attending at 90% is a class total of approximately 89.

What did you get?