Question

9 out of 10 students average height is 130 CM ,10th student height is 9 CM greater than avarage height of 10 students,what is the height of 10th student?

Answer 1

Answer:

140 cm

Step-by-step explanation:

avg height of 9 students = 130 cm

sum of height of 9 students = 130*9=1170 cm

let height of 10th student = x

then avg height of 10 students= (1170+x)/10

     A.T.Q

x=[(1170+x)/10]+9

x-9=(1170+x)/10

10x-90=1170+x

9x=1260

x=140cm ANS