During the past school year, there were 640 students and 52 teachers. What is the ratio of students to each teacher rounded to the nearest tenth?

Divide the number of students by the number of teachers: 640 ÷ 52 ≈ 12.3077. Rounded to the nearest tenth, that is 12.3 students per teacher, or 12.3:1. The correct choice is 12.3:1.

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