The school bought a batch of basketballs. If there are 3 basketballs in each class, they can be distributed to 15 classes. If there are 5 basketballs in each class, how many classes can they be distributed to?
学校买来一批篮球，如果每班3个，正好可以分给15个班，如果每班5个，可以分给几个班？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">15 * (3/5)</gadget>
<output>9</output>

<result>9</result>