A batch of computers were donated to Hope Primary School. If there are 3 units in each class, it can be assigned to 15 classes. If there are 9 units in each class, how many classes can it be assigned to?
一批电脑捐给希望小学．如果每班3台，正好可以分给15个班，如果每班9台，可以分给几个班？
<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15 * (1/3)</gadget>
<output>5</output>

<result>5</result>