On the first day of a semester, a film club has 90 members. Each day after the first day of the semester, 10 new members join the film club. If no members leave the film club, how many total members will the film club have 4 days after the first day of the semester?
Correct answer: B (parsed from the explanation — this source omits an answer key for this item)
Explanation
90 Choice B is correct. It’s given that the film club has members on the first day 10 of a semester, and new members join the film club each day after the first day 4#10 40 of the semester. This means that after 4 days, , or , new members will 40 90 have joined the club. Adding members to the original club members yields 130 130 members. Thus, the film club will have total members 4 days after the first day of the semester. Choice A is incorrect. This is the number of members that will have joined the film 100 10 club 4 days after the first day of the semester if new members, not , join the film club each day. Choice C is incorrect. This is the number of members the film club will have 4 days after the first day of the semester if 1 new member, not 10 , joins the film club each day. Choice D is incorrect. This is the number of members the film club has on the first day of the semester.
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