The following questions have three statements. Study the question and the statements and decide which of the statement(s) is/are necessary to answer the question. There are some Executives and some Managers in an office. Total salary of all the employees is Rs. 576000. Find the total number of employees in the office. Statement I∶ 25% of the salary of a manager is Rs. 15000. Statement II∶ The ratio of number of Executives and Managers is 3 ∶ 2. Statement III∶ Total monthly salary of all the Executives is 40% less than total salary of all the Managers. Correct Answer All the statements are required to answer the question. Statement III∶ Total monthly salary of all the Executives is 40% less than total salary of all the Managers; Total salary of all the employees is Rs. 576000; ∴ (Total salary of managers) + 0.6 × (Total salary of managers) = 576000 ⇒ 1.6 × (Total salary of managers) = 576000 ⇒ (Total salary of managers) = 576000/1.6 = Rs. 360000 Statement I∶ 25% of the salary of a manager is Rs. 15000. ∴ Salary of a manager = Rs. 60000 ∴ Total managers = 360000/60000 = 6 Statement II∶ The ratio of number of Executives and Managers is 3 ∶ 2; ∴ Total executives = 9 ∴ Total number of employees in the office = 6 + 9 = 15 ∴ All the statements are required to answer the question.