The school planted a total of 90 trees for greening the campus, of which apple trees and white orchid trees accounted for 70% of the total. It is known that the ratio of apple trees to brandy trees is 5:4, how many apple trees are there?
学校为绿化校园共植树90棵，其中苹果树和白兰树的棵数占总棵数的70%．已知苹果树和白兰树的比是5：4，苹果树有多少棵？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">90 * (7/10) * (5/9)</gadget>
<output>35</output>

<result>35</result>