Aptitude - Problems on Ages - Discussion
Each of the questions given below consists of a statement and / or a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statement(s) is / are sufficient to answer the given question. Read the both statements and
- Give answer (A) if the data in Statement I alone are sufficient to answer the question, while the data in Statement II alone are not sufficient to answer the question.
- Give answer (B) if the data in Statement II alone are sufficient to answer the question, while the data in Statement I alone are not sufficient to answer the question.
- Give answer (C) if the data either in Statement I or in Statement II alone are sufficient to answer the question.
- Give answer (D) if the data even in both Statements I and II together are not sufficient to answer the question.
- Give answer(E) if the data in both Statements I and II together are necessary to answer the question.
Average age of employees working in a department is 30 years. In the next year, ten workers will retire. What will be the average age in the next year? | |
I. | Retirement age is 60 years. |
II. | There are 50 employees in the department. |
I. Retirement age is 60 years.
II. There are 50 employees in the department.
Average age of 50 employees = 30 years.
Total age of 50 employees = (50 x 30) years = 1500 years.
Number of employees next year = 40.
Total age of 40 employees next year (1500 + 40 - 60 x 10) = 940.
| Average age next year = | 940 | years = 23 | 1 | years. |
| 40 | 2 |
Thus, I and II together give the answer. So, correct answer is (E).
We added 40 because the remaining 40 employees age will be increased by 1 in the next year hence we have to add 40 to calculate the sum of ages all 40 employees.
Why 40 has added to 910?