Our school has 84 basketballs, each class borrows 6, and there are 8 classes in total. How many basketballs are left.
我们学校有84个篮球，每班借6个，共有8个班．还剩多少个篮球．
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">84 - 48</gadget>
<output>36</output>

<result>36</result>