Consider the following premises. For all z, z will work or z will not cook. For all z, if z were a musician, then z is cooking. For all z, if z works, then z is a musician. Can we infer the following from them? If Susan cooks, then Susan is working.
 From the fact that for all z, if z works, then z is a musician, and that for all z, if z were a musician, then z is cooking we can infer that for all z, if z works, then z is cooking. From the fact that for all z, z will work or z will not cook we can infer that for all z, if z cooks, then z is working. From the fact that for all z, if z works, then z is cooking, and that for all z, if z cooks, then z is working we can infer that for all z, z will work if and only if z will cook. From the fact that for all z, z will work if and only if z will cook we can infer that Susan is working if and only if Susan is cooking. Finally, from the fact that Susan is working if and only if Susan is cooking we can infer that if Susan cooks, then Susan is working. Therefore, the answer is yes.