you would have 13 peoples in the Eiffel Tower side of the diagram. and then you would have 16 people on the Notre Dame cathedral side. and none in the middle of the diagram. the answer to question b would 29/30 since that is the number of people who exclusively went to et or ndc.
Step-by-step explanation:
if that isnt the right answer is it possible the question was phrased incorrectly and instead was supposed to 7 people went to both et and ndc?