Consider the following premises. Jennifer is a sailor or Sarah is not making tea. If Jennifer were a sailor, then Sarah is making tea. Can we infer the following from them? Jennifer is a sailor if and only if Sarah is making tea.
 From the fact that Jennifer is a sailor or Sarah is not making tea we can infer that if Sarah makes tea, then Jennifer is a sailor. Finally, from the fact that if Jennifer were a sailor, then Sarah is making tea, and that if Sarah makes tea, then Jennifer is a sailor we can infer that Jennifer is a sailor if and only if Sarah is making tea. Therefore, the answer is yes.