How much less is 3 times 18 than the product of 8 times 9?
18的3倍比8乘9的积少多少？
<gadget id="calculator">8 * 9</gadget>
<output>72</output>

<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">72 - 54</gadget>
<output>18</output>

<result>18</result>