There are a total of 1800 books, we get (2/9) for the sixth grade, and the number of books for the fifth grade is equivalent to (4/5) for the sixth grade, how many books for the fifth grade?
一共1800本，我们六年级分得(2/9)，分给五年级的本数相当于六年级的(4/5)，五年级分得多少本？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_800 * (2/9) * (4/5)</gadget>
<output>320</output>

<result>320</result>