What is life expectancy for someone with cancer of the pancreas, small intestine and gall bladder? This person presently cannot eat or drink liquids

Stage of cancer. Every cancer is unique and the statistical prognosis varies on the cancer and the stage. One thing for sure, poor nutritional state are is not good signs for any cancer.
Depends. This depends on what kind of cancer. If it is an adenocarcinoma that is widely metastatic to these organs, generally the survival is short, measured in months. There are some types of lymphoma that respond very well to chemotherapy, but this is rare to involve the gallbladder and the pancreas.