To determine the number of vans needed for 24 students where each van can hold 10 students, you can use the following calculation:
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Divide the total number of students by the capacity of each van:
\[ \frac{24}{10} = 2.4 \]
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Since you can't have a fraction of a van, you need to round up to the nearest whole number. This means you will need 3 vans to accommodate all 24 students.
Therefore, the answer is 3 vans.