The middle and senior students in the school planted trees. The senior grades planted 60% of the total number of trees, more than 120 trees, and the middle grades planted 1/3 of the senior grades. How many saplings are there in this batch?
学校中、高年级同学去植树，高年级植了总棵数的60%多120棵，中年级植的是高年级的(1/3)，这批树苗有多少棵？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

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

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/4) - (3/5)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">120 / (3/20)</gadget>
<output>800</output>

<result>800</result>