The school purchased 1,200 books and distributed them to the third, fourth, and fifth grades, distributed to the total number of fifth grades (1/3), distributed to the rest of the fourth grade (3/8), how many books were distributed to the third grade?
学校购买了1200本图书，分给三、四、五年级，分给五年级总数的(1/3)，分给四年级余下的(3/8)，三年级分到多少本？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1_200 * (1/3)</gadget>
<output>400</output>

<gadget id="calculator">1_200 - 400</gadget>
<output>800</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">800 * (3/8)</gadget>
<output>300</output>

<gadget id="calculator">1_200 - 400 - 300</gadget>
<output>500</output>

<result>500</result>