Question

the average height of 60 students In a class is 150 cm 20 new students join the class and average become 160 cm what is the average height of this 20 new students

Answer 1

average height of 60 students = 150 so it will be 9000/60.

the total height of 60 children = 9000.

if 20 students will come the no of students will be 80.

let the total height be x.

then, x/80 = 160.

x= 160*80 = 12800.

total height of 20 children will = 12800 - 9000 = 3800.

average height of 20 children will be 3800/20 = 190.