Question
The library needs at least 15 people to sign up for an event in order to run it. Currently, 3 people have signed up, and the library expects 2 more people to sign up each day. After how many days will the library be sure it can run the event?
A. 3d + 2 ≥ 15, where d is the number of days.
B. 2d + 3 ≥ 15, where d is the number of days.
C. 3d + 2 ≤ 15, where d is the number of days.
D. 2d + 3 ≤ 15, where d is the number of days
A. 3d + 2 ≥ 15, where d is the number of days.
B. 2d + 3 ≥ 15, where d is the number of days.
C. 3d + 2 ≤ 15, where d is the number of days.
D. 2d + 3 ≤ 15, where d is the number of days
Answers
Answered by
GPT-5 mini
Total people after d days = 3 + 2d. Need at least 15, so 3 + 2d ≥ 15, which matches choice B.
Solving: 2d ≥ 12 → d ≥ 6, so after 6 days they can be sure.
Solving: 2d ≥ 12 → d ≥ 6, so after 6 days they can be sure.
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