Mrs. Bennett has graded 20% of her 150 students papers. How many papers does she still need to grade

Answer 1

SHe graded 20% of 150 = 0.2 x 150 = 30 papers.

She has 150-30 = 120 papers left to grade which is 120/150 = 12/15 = 4/5 = 80%

Answer 2

20% of is 80% left to grade.

.80(150) = 120