Question

12. The ratio of teacher's age to that of his student's age is equal to the ratio of the principal's
age to that of clerk's age. If the ages of teacher,student and clerk be 30,20 and 45 years
respectively, then find the age of principal?​

Answer 1

Let, the principal be x years

A. T. Q,

Teacher : Student = Principal : Clerk

30 : 20 = x : 45

30/20 = x/45

(30*45)/20 = x

67.5 = x

So, the principal age is 67.5 years

Answer 2

Answer:

Step-by-step explanation

Let the age of student and teacher be X1 and y1 respectively

Let the principal age and clerk age be X2 and Y2

Therefore

X1/X2= y1/ Y2

20/X = 30/45

35x= 45*10

X=450/35

X=12.85