Teacher Wang divides the students in the five-year class into groups to plant trees. They can be divided into groups of 4 or 6, and they can be divided exactly. How many students are there in the five-year class? (The class size is between 40 and 50)
王老师把五年一班的学生分成小组来植树，按4人一组，6人一组，都能正好分完，五年一班有多少人？(班级人数在40～50之间)
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