The school shipped 600 naked saplings and distributed them to the fourth, fifth, and sixth grade students according to the ratio of 3:4:5. How many more trees are in the sixth grade than in the fourth grade?
学校运来600裸树苗，按3﹕4﹕5分配给四、五、六年级同学种植，问六年级比四年级多分多少棵？
<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(5/12) - (1/4)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">600 * (1/6)</gadget>
<output>100</output>

<result>100</result>