It takes 100 days for A to complete a project independently, and the total price is 800,000 yuan, and it takes 80 days for B to complete independently, with a total price of 1 million yuan. How many days does A and B cooperate?
一项工程甲独立完成需100天，总价80万元，乙独立完成需80天，总价100万元，现在甲乙合作几天后，剩下的由甲单独完成，共需86.5万元，甲乙合作多少天？
<gadget id="calculator">86.5 - 80</gadget>
<output>6.5</output>

<gadget id="calculator">1 / 80</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">100 * (1/80)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">80 * (1/80)</gadget>
<output>1</output>

<gadget id="calculator">(5/4) - 1</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6.5 / (1/4)</gadget>
<output>26</output>

<result>26</result>