The average height of class VIII students is 120 cm. After some days 5 new students joined and they are 130 cm, 132 cm, 135 cm, 138 cm, and 140 cm respectively. Then the average height of the class increased by 3 cm. Find the total number of students of class VIII now.
1
20
2
30
3
15
4
25
5
None of these