The average age of the four female teachers in a school is 40 and the average age of eight male teachers in the school is 25. Calculate the average age of the teachers in the school.
A
20
B
31
C
32
D
30
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
Total ages of four female teachers = 4 x 40 = 160
Total ages of eight male teachers = 8 x 25 = 200
Total ages of all the teachers in the school = 160 + 200 = 360
Average ages of all the teachers = \(\frac{\text{ total ages of all teachers}}{\text{total number of teachers}}\)
= \(\frac{360}{12}\) = 30.
Source: WAEC / JAMB / NECO Classroom Archive (Record #70272)