Answer: The officer will escort 38 inmates to the gym.
Step-by-step explanation:
Let's break down the information step by step:
1. Initially, there were 59 inmates in the unit.
2. Before the gas leak, 13 inmates were sent to the hospital for medical care.
3. Out of those 13 inmates, 2 were transferred to intensive care and 4 remained in the hospital. This means that 7 inmates returned to the unit after receiving medical care.
4. Since 7 inmates returned to the unit before the evacuation, the officer does not need to escort them to the gym.
5. To calculate the number of inmates the officer needs to escort, we subtract the 7 inmates who returned from the initial number of inmates: 59 - 7 = 52.
Therefore, the officer will escort 52 inmates to the gym.