The money in Xiaoliang's body can just buy 12 rubbers or 4 ballpoint pens. He bought 3 rubbers first, and the rest of the money can buy as many ballpoint pens.
小亮身上的钱正好可以买12块橡皮或4支圆珠笔，他先买了3块橡皮，剩下的钱还可以买多少支圆珠笔．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<result>3</result>