The average age 40 teachers of a school is 35 years. Out of these, the average age of 25 teachers is 30 years and that of the other 15 teachers is 39 years. The age of the 40th teacher is?
Answers:
A) 65
B) 69
C) 61
D) 62
E) 72
65ge of the 40th teacher= 40*35 - (25*30+15*39) = 1400-1335= 
<gadget id="calculator">1400-1335</gadget>
<output>65</output>
65 years   65nswer is 65
<result>A</result>
The average age 40 teachers of a school is 35 years. Out of these, the average age of 25 teachers is 30 years and that of the other 15 teachers is 39 years. The age of the 40th teacher is?