model airplane competition was held in the county. Fang Fang's final score was 22.5 seconds, which was (1/4) higher than the preliminaries. How many seconds was Fang Fang's preliminaries?
县里举行航模比赛，方方的决赛成绩是22.5秒，比预赛成绩提高了(1/4)，方方的预赛成绩是几秒？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">22.5 / (5/4)</gadget>
<output>18</output>

<result>18</result>