Question

The average height of 16 pupils is 125cm,when 4 pupils were added the average height was 125cm what is the average height of the 4 new pupils

Answer 1

Answer:

20 cm

Step-by-step explanation:

Sum of height / 16 = 125 cm

Sum of height = 16 * 125 = 2000 cm

After adding 4 pupils,

Average height = Sum of height + sum of heights of new students/ 20 = 125 cm

2000 cm + Sum of heights of new students = 2500 cm

Sum of heights of new students = 500 cm

Average of heights of new pupils = Sum of heights of new pupils/ 4= 500 cm/4 =20cm