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b) 2c/10

c) c/5

d) 2c/5

Final answer:To calculate the amount of flour needed for one chocolate cake out of the twenty baked by the club, divide the total flour used (c) by the 20 cakes made (c/20). However, this result does not match the options given, implying there may be an error in the question or the answer options.Explanation:To find the amount of flour used for one chocolate cake in the context of the students in the baking club, we need to express the total amount of flour (c) as a function of the individual cakes made. Since there are 10 students and each student made 2 cakes, this amounts to a total of 10 students × 2 cakes/student = 20 cakes in all. Therefore, the total flour used for one cake is the total flour (c) divided by the total number of cakes (20), which simplifies to c/20 per cake. However, the question seems to imply a potential typo, and the correct options do not match this calculation. Assuming there might be a mistake, and we are to find how much flour is needed for the 2 cakes baked by one student, we would divide the total cups of flour by the number of students which gives c/10. If we are looking for the amount of flour perone cakeunder this assumption, we can further divide by 2, which provides (c/10)/2, simplifying to c/20. This is not one of the offered options. Hence, we might conclude there is an error in the question or the provided options....

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