Question

153.The average age of 30 boys in class and a teacher is 15. If the age of the teacher is 30 year what would be the average age of boys only ? (a) 15 (b) 14 (c) 13 (d) 16

Answer 1

Answer:

14.5

Step-by-step explanation:

let the sum of the age of the boys be x

\frac{x+30}{31} = 15[/tex]

x+30=(15)(31)

x+30=465

x=435

avg age of boys= $\frac{x}{30}$ = 435/30

                          = 14.5