The average age of a group of 5 students is 18 years. When a new student joins the group, the average age increases to 19 years. What is the age of the new student?
Q1. The average age of a group of 5 students is 18 years. When a new student joins the group, the average age increases to 19 years. What is the age of the new student?
Answer: 24 years
Explanation: Old total age = 5×18 = 90; new total = 6×19 = 114; new student's age = 114−90 = 24 years.