In class, students are reviewing Chinese or mathematics. 48% of those who only reviewed Chinese, and 50% of those who only reviewed Chinese, then, how many of them reviewed both subjects?
课堂上同学们都在复习语文或数学．只复习了语文的占48%，只复习了数学的占只复习了语文的人数的50%，那么，两门功课都复习的占了多少．
<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>