During a trip, half of the boys and girls (1/4) have a total of 15 people, and half of the girls and boys (1/4) have a total of 12 people. How many students are there in total?
一次旅行时，男生的一半和女生的(1/4)共15人，女生的一半和男生的(1/4)共12人，问共有多少学生？
<gadget id="calculator">15 + 12</gadget>
<output>27</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) + (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">27 / (3/4)</gadget>
<output>36</output>

<result>36</result>