(3) Total number of students = 90 Now, each of 50% of students get 20% of the total number of students i. e., 20% of 90 = 18 Also, each of remaining 50% of students get 10% of the total number of students i. e., 10% of 90 = 9 Hence, total number of sweets distributed = 45 x 18 + 45 x 9 = 45 x (18 + 9) = 45 x 27 = 1215