Shengli Primary School participated in the afforestation activities. The lower grade students planted 40% less than the middle grade students, and the lower grade students planted 75% less than the upper grade students. It is known that the middle grades planted 120 trees, and how many trees were planted in the upper grades?
胜利小学参加植树造林活动，低年级学生比中年级学生少40%，低年级学生比高年级学生少植75%，已知中年级植树120棵，高年级植树多少棵？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">120 * (3/5)</gadget>
<output>72</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">72 / (1/4)</gadget>
<output>288</output>

<result>288</result>