The school distributes 300 books to the three classes of the third grade. The first class is divided into (1/6) and the second class is divided into (2/5). How many books are divided into the third class?
学校将300本书分给三年级三个班，一班分到(1/6)，二班分到(2/5)，问三班分到多少本？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/6) - (2/5)</gadget>
<output>13/30 = around 0.433333</output>

<gadget id="calculator">300 * (13/30)</gadget>
<output>130</output>

<result>130</result>