When calculating division, Xiao Ming mistakenly wrote the divisor 24 as 42, and the resulting quotient is 10 with a remainder of 12. What is the original correct formula?
小明在计算除法时，把除数24误写成了42，结果得到的商是10还余12，原来正确的算式是多少
<gadget id="calculator">42 * 10</gadget>
<output>420</output>

<gadget id="calculator">420 + 12</gadget>
<output>432</output>

<gadget id="calculator">432 / 24</gadget>
<output>18</output>

<result>18</result>