There are 450 new books in the school library, and they are distributed to the fifth and sixth grades according to 4; 5. How many books should the sixth grade divide?
学校图书馆新进450本图书，按4；5分给五年级和六年级，六年级应分多少本？
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

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

<gadget id="calculator">450 * (5/9)</gadget>
<output>250</output>

<result>250</result>