The school plans to hold adventure summer camp activities in the middle and senior grades. There are 360 registered campers, and the fourth, fifth and sixth grades will be allocated according to the ratio of 3:4:5. How many fewer students are in the fifth grade than in the sixth grade?
学校准备在中、高年级举行探险夏令营活动，报名营员有360人，四、五、六年级按3：4：5的比例进行分配．五年级比六年级少多少人？
<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">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/12) - (1/3)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">360 * (1/12)</gadget>
<output>30</output>

<result>30</result>