The school currently has 150 books, 40% of which are distributed to Class 1, and the remaining books are distributed to Class 2 and Class 3 at a ratio of 4:5. How many books can the three classes get?
学校现有图书150本，其中的40%分给一班，剩下的图书按照4：5分给二班和三班．三班可以分得多少本图书？
<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">150 * (3/5)</gadget>
<output>90</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 * (5/9)</gadget>
<output>50</output>

<result>50</result>