In the "Scholarly Campus" activity, our school newly purchased 1,800 books and distributed them to the three grades of low, middle and high according to the ratio of 3:4;5.
在"书香校园"活动中，我校新购进1800本图书，按3：4；5的比例分配给低、中、高三个年级，中年级分得多少本．
<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1_800 * (1/3)</gadget>
<output>600</output>

<result>600</result>