There are 90 triple-good students in the upper grades of a certain school, and the number of triple-good students in the middle grades is the upper grade (5/6). How many triple-good students are there in the middle grades?
某校高年级有三好学生90人，中年级三好学生人数是高年级的(5/6)，中年级有三好学生多少人？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">90 * (5/6)</gadget>
<output>75</output>

<result>75</result>