Aunt Wang bought a toy car for each child in the small class of the kindergarten. If she bought a toy car for 9 yuan, it would cost 72 yuan. Later, she bought a toy car for 7 yuan. How much money can she save?
王阿姨给幼儿园小班的每个小朋友买一辆玩具小汽车，如果买9元钱一辆的需要72元，后来她买了7元一辆的玩具小汽车，这样可节省下来多少钱？
<gadget id="calculator">72 / 9</gadget>
<output>8</output>

<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<gadget id="calculator">72 - 56</gadget>
<output>16</output>

<result>16</result>