Consider the following premises. There is at least one x_5 for which x_5 is a mechanic or x_5 will work. For all x_5, if x_5 were a mechanic, then x_5 is rich. For all x_5, x_5 will drink water if and only if x_5 will work. For all x_5, if x_5 were rich, then x_5 is drinking water. Can we infer the following from them? There is at least one x_5 for which x_5 will drink water.
 From the fact that for all x_5, if x_5 were a mechanic, then x_5 is rich, and that for all x_5, if x_5 were rich, then x_5 is drinking water we can infer that for all x_5, if x_5 were a mechanic, then x_5 is drinking water. From the fact that for all x_5, x_5 will drink water if and only if x_5 will work we can infer that for all x_5, if x_5 works, then x_5 is drinking water. Finally, from the fact that for all x_5, if x_5 were a mechanic, then x_5 is drinking water, that for all x_5, if x_5 works, then x_5 is drinking water, and that there is at least one x_5 for which x_5 is a mechanic or x_5 will work we can infer that there is at least one x_5 for which x_5 will drink water. Therefore, the answer is yes.