There are more (2/9) people in the fifth grade sports "up to the standard" than in the fourth grade, and there are actually 12 more people. How many people have "reached the standard" in fourth grade sports?
五年级体育"达标"人数比四年级多(2/9)，实际多12人．四年级体育"达标"的有多少人？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">12 / (2/9)</gadget>
<output>54</output>

<result>54</result>