The average age of students is A and the average age of teachers is B. The number of the students is 45 times of the number of teachers. What is average age of students and teachers together?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. (45A+B)/46.
| Understanding/Application |
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Let total teachers is x, and thus total number of students = 45x Total age of students = 45Ax and total age of teachers = Bx |
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Average = (45Ax + Bx)/(x + 45x) = (45A + B)/46 |