Three kinds of trees have been newly planted on campus. There are 40 willows, accounting for 2/5 of the total trees. The ratio of ginkgo to magnolia is 7:8. How many ginkgos are planted in the campus?
校园新栽了三种树，柳树有40棵，占总棵树的(2/5)，银杏与广玉兰棵数的比是7：8，校园里银杏栽了多少棵？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 / (2/5)</gadget>
<output>100</output>

<gadget id="calculator">100 - 40</gadget>
<output>60</output>

<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">60 * (7/15)</gadget>
<output>28</output>

<result>28</result>