Xiao Ming: It will take me 10 hours to type this manuscript. Baofeng: I need 8 hours. The two of them typed together for 4 hours, and there were still 5,000 words left in the structure. How many words are there in this manuscript?
小明：打这份稿件我需10小时．宝凤：我需8小时．他俩合打了4小时，结构还剩下5000个字，算算这份稿件有多少个字？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/10) + (1/8)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(9/40) * 4</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">5_000 / (1/10)</gadget>
<output>50_000</output>

<result>50_000</result>