In the self-study class, the students in class 61 were all reviewing Chinese or mathematics, 48% of them only reviewed Chinese, and those who only reviewed mathematics only reviewed 50% of Chinese. In this self-study class, both homework The number of reviewers accounted for the total number of people.
自习课上，六1班的同学都在复习语文或数学，只复习了语文的占48%，只复习了数学的是只复习了语文的50%，在这节自习课上，两门功课都复习的人数占总人数的多少．
<gadget id="calculator">48 / 100</gadget>
<output>12/25 = around 0.48</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(12/25) * (1/2)</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">(12/25) + (6/25)</gadget>
<output>18/25 = around 0.72</output>

<gadget id="calculator">1 - (18/25)</gadget>
<output>7/25 = around 0.28</output>

<result>7/25 = around 0.28</result>