When Honghong is doing an addition calculation, she regards 45 as 54, and the result is 72. What is the correct result?
红红在做一道加法算式时，把45看成54，结果得72，正确的结果是多少
<gadget id="calculator">72 - 54</gadget>
<output>18</output>

<gadget id="calculator">45 + 18</gadget>
<output>63</output>

<result>63</result>