Question

In a class, average height of all students is p cm. Among them average height of 10 students is q cm and average of remaining students is r cm. Find the number of student in class.

Answer 1

Answer:

plz following...........

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Answer 2

The total number of student is (10q-10r)/(p-r)

Given data :

Average height of all students = p cm

Average height of 10 students = q cm

Average height of remaining students = r cm

Let,the total students = x

So, total height of all students = p × x = px cm

Total height of 10 students = 10 × q = 10q cm

Remaining students = (x-10)

Total height of remaining students = r × (x-10) = rx-10r

Now,

px =10q + rx -10r

px-rx = 10q-10r

x (p-r) = 10q-10r

x = (10q-10r)/(p-r) (Answer)