Question

The average height of three girls is 120 cm. The two girls have height 110 cm and 125 cm. What is the height of the third girl?​

Answer 1

Answer:

Height of the girl=125 cm.

Step-by-step explanation:

Unknown height of the third girl=x cm

Number of girls=3

Average height=120 cm

Average of height= sum of height of all girls/ Total number of girls.

120=110+125+x/3

120=235+x/3

120×3 = 235+x

360=235+x

x=360-235

x=125 cm.

Answer 2

Step-by-step explanation:

height of third girl = X

average - sum of observation/no. of observation

120cm = 110+125+x/3

120×3 = 235+x

360 -235

125 cm