Sixth-grade students subscribe to three kinds of newspapers, and each person is required to subscribe to two different newspapers. They subscribed 120 copies of "Youth Daily", 95 copies of "Chinese Journal", and 121 copies of "Mathematics Journal".
六年级学生订三种报纸，规定每人分别订两种不同的报纸．他们共订了《少年报》120份，《语文报》95份，《数学报》121份，求同时订《语文报》、《数学报》的共有多少人．
<gadget id="calculator">120 + 95 + 121</gadget>
<output>336</output>

<gadget id="calculator">336 / 2</gadget>
<output>168</output>

<gadget id="calculator">168 - 120</gadget>
<output>48</output>

<result>48</result>