Consider the following premises. For all x_5, if x_5 were rich, then x_5 is a musician. For all x_5, if x_5 were a mechanic, then x_5 is rich. For all x_5, x_5 is a musician if and only if x_5 will drink water. Can we infer the following from them? For all x_5, if x_5 were a mechanic, then x_5 is drinking 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 a musician we can infer that for all x_5, if x_5 were a mechanic, then x_5 is a musician. From the fact that for all x_5, x_5 is a musician if and only if x_5 will drink water we can infer that for all x_5, if x_5 were a musician, 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 a musician, and that for all x_5, if x_5 were a musician, 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. Therefore, the answer is yes.