The average age of a group of 10 students is 14 years. If 5 more students join the group, the average age rises by 1 year. The average age of the new students is: Choose the correct answer:
A) 22
B) 38
C) 11
D) 17
E) 91
Explanation:   Total age of the 10 students = 10 × 14 = 140   Total age of 15 students including the newly joined 5 students = 15 × 15 = 225   Total age of the new students = 225 − 140 = 85   Average age = 85/5= 
<gadget id="calculator">85/5</gadget>
<output>17</output>
17 years   Answer: 17
<result>D</result>
The average age of a group of 10 students is 14 years. If 5 more students join the group, the average age rises by 1 year. The average age of the new students is: