Can someone please help me how to solve this 3 part Chem Eng. Question. I'd really appreciate it

(a) In 1994, a nationwide outbreak of Salmonellosis was attributed to the consumption of ice cream. At the outset of the outbreak, a case-control study was conducted to determine the risk factors for illness. From this study, it was determined that ice cream had been eaten by 12 of the 15 patients (cases) and only by 3 of the 15 controls. Given these statistics, calculate the Odds Ratio.

(b)Based on the results of the case-control study in Problem 1, a nationwide recall of all of the ice cream produced from September 1 to September 30 at the ice cream plant was initiated. Following this recall, a cross-sectional study of 159 households that had purchased ice cream was conducted. This study indicated that, on average, each household contained 2.8 people who consumed ice cream and 0.4 who did not. Among those who ate ice cream, 30 people experienced symptoms of Salmonellosis (diarrhea and fever or chills). Amongst those who did not eat ice cream, only two people experienced these symptoms. What was the attack rate (answer as a percentage) for those who ate ice cream? What was the attack rate (answer as a percentage) for those who did not eat ice cream? What was the relative risk between the two groups?

(3)Assuming the ice cream manufacturer in Problems 1 and 2 produced 1.06 106 gallons of ice cream during the month of September and each gallon was consumed by 2.8 people, estimate the total number of potential cases of gastroenteritis caused by Salmonella enteritidis food infection that could have resulted from this incident.