There are 320 students in grades 3, 4, and 5. The ratio of students in grades 3 and 4 is 5:6, and the number of students in grade 5 is that of grade 4 (3/10). How many more students are in the third grade than the fifth grade?
学校三、四、五年级一共有学生320人，三年级和四年级的学生人数比是5：6，五年级的人数是四年级的(3/10)．三年级比五年级多多少人？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(5/6) + (3/10) + 1</gadget>
<output>32/15 = around 2.133333</output>

<gadget id="calculator">320 / (32/15)</gadget>
<output>150</output>

<gadget id="calculator">(5/6) - (3/10)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">150 * (8/15)</gadget>
<output>80</output>

<result>80</result>