Question

39. Average age of a group of five students is 14 yr.
If a new student also admitted the group, new
average age becomes 13 yr. Find the age of new
student.
(a) 13 yr (b) 10 yr
(c) 7 yr (d) 8 yr​

Answer 1

Answer:

8 yrs

Step-by-step explanation:

Average age of 5 students  = 14yrs

=> sum of their ages = 14*5 = 70yrs

Average age of 6 students  = 13yrs

=> sum of their ages = 13*6 = 78

=> the age of the new boy = 78 - 70 = 8 yrs