Question

The average height of a class of 18 students is 105 cm After arrival of 7 new students the

average decrees by 5 cm. Find sum of height of all the students of the class.

Answer 1

Total number of students = 18 + 7 = 25

Average height of the 25 students = 105 - 5 = 100 cm

Sum of height of all students = 100 x 25 = 2500cm

Answer: 2500cm