Total height of a class is 1500 cm. If the average height of a class is 50 cm, find the number of students in the class.
10
20
30
40
Explanation:
Total height of a class = 1500 cm.
Average = 50 cm.
No. of students = Total ÷ Average
= 1500 ÷ 50
= 30
Therefore, number of students in the class = 20