Wang Xiaoming of class 5.1 found in a survey that (4/5) of the students in the class like mathematics; (3/4) of the students like Chinese; /20); what percentage of the class are students who like both Chinese and mathematics?
5.1班的王小明在一次调查中发现，全班有(4/5)的同学喜欢数学；(3/4)的同学喜欢语文；数学、语文两科都不喜欢的同学占全班同学的(1/20)；既喜欢语文又喜欢数学的同学占全班的几分之几？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) + (3/4)</gadget>
<output>31/20 = around 1.55</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">(31/20) - (19/20)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>