Consider the following premises. For all x_20, x_20 will make tea if and only if x_20 will drink water. It is sunny. If Robert doesn't make tea, then it is overcast. Robert is not drinking water. Can we infer the following from them? It is sunny and it is overcast.
 From the fact that for all x_20, x_20 will make tea if and only if x_20 will drink water we can infer that Robert is making tea if and only if Robert is drinking water. From the fact that Robert is making tea if and only if Robert is drinking water, and that Robert is not drinking water we can infer that Robert is not making tea. From the fact that if Robert doesn't make tea, then it is overcast, and that Robert is not making tea we can infer that it is overcast. Finally, from the fact that it is sunny, and that it is overcast we can infer that it is sunny and it is overcast. Therefore, the answer is yes.