The average age of a group of 3 boys P, Q, and R are 60 years. when a new boy S joins the group the average age of the group is increased by 16.66 %. Another boy T’s age is 19 years more than the age of S . Then what is the average age of S and T?
1
109.5
2
111.5
3
107.5
4
59.5