In Yucai Primary School, the number of students in the upper grades is the number of students in the middle and lower grades (1/2); in the upper grades, the number of boys is the number of girls (5/7); in the number of students in the middle and lower grades, the number of girls is the number of boys (3/4 ), then at least how many people are there in Yucai School.
育才小学高年级学生是中低年级学生的(1/2)；在高年级中，男生人数是女生人数的(5/7)；在中低年级中，女生人数是男生人数的(3/4)，则育才学校至少有多少人．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">24 * 7</gadget>
<output>168</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">24 * (7/2)</gadget>
<output>84</output>

<gadget id="calculator">168 + 84</gadget>
<output>252</output>

<result>252</result>