There are 48 people in the fourth class of five years, and each of them ordered at least one kind of reading material. Among them, (5/6) of the students subscribed to "Primary School Students' Mathematics Newspaper", and (3/4) students ordered "Primary School Students' Chinese Newspaper". Everyone subscribes to at least one kind of reading newspaper, and how many students subscribe to both kinds of reading materials.
五年四班有48人，每人至少订一种读物，其中(5/6)的同学订了《小学生数学报》，(3/4)的同学订了《小学生语文报》，已知每人至少订一种读报，两种读物都订的同学有多少人．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - 1</gadget>
<output>-1/4 = around -0.25</output>

<gadget id="calculator">(5/6) + (-1/4)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">48 * (7/12)</gadget>
<output>28</output>

<result>28</result>