If the 450 books are divided into Class A with 40 students and Class B with 50 students, how many books will Class A get?
把450本书按照甲班40人，乙班50人分配，甲班分到多少本？
<gadget id="calculator">50 + 40</gadget>
<output>90</output>

<gadget id="calculator">40 / 90</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">450 * (4/9)</gadget>
<output>200</output>

<result>200</result>