Question

The average height of 18 students is 105 cm. If 7 students are added then average height decrease by 5cm. Find the sum of height of all students

Answer 1

2500 cm

==============

Initial number of students is 18 and 7 students are added, it gives us the total of:

• 18 + 7 = 25 students

Initial average is 105 cm and it decreases by 5 cm, so it becomes:

• 105 - 5 = 100 cm

To find the sum of the heights we need to multiply the number of students by the average height:

• 25*100 = 2500 cm

So the sum of height of all students is 2500 cm.