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.

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

2500cm

hello i am doing good for you that it's summer in your country or state ; )

btw in my country we just have sun and rain as (because i live in the caribbean lol)

also, thx a lot for the points : )