What is the product of the difference of 193 minus 178 and the sum of 12 and 18?
193减去178的差，乘12加18的和，积是多少？
<gadget id="calculator">193 - 178</gadget>
<output>15</output>

<gadget id="calculator">12 + 18</gadget>
<output>30</output>

<gadget id="calculator">15 * 30</gadget>
<output>450</output>

<result>450</result>