To print a manuscript, it takes 10 hours for A to type alone, and 8 hours for A and B to type together. It is known that A typed 6000 more characters per hour than B. How many characters are there in this manuscript?
打印一份稿件，甲单独打用10小时完成，甲乙共同来打用8小时完成，已知甲每小时比乙多打6000个字，这份稿件共有多少个字？
<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">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/10) - (1/40)</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">6_000 / (3/40)</gadget>
<output>80_000</output>

<result>80_000</result>