It takes 10 days, 12 days, and 15 days for A, B, and C to move the goods in warehouse A. Now it is also known that the goods in warehouse B are 25% more than those in warehouse A. At the beginning, A is handling goods in warehouse A, and B and C are handling goods in warehouse B at the same time. After moving for several days, C went to help A move the goods from warehouse A, and happened to finish moving the goods from warehouse A and warehouse B at the same time. How many days did C and A move?
搬运A仓库的货物，甲、乙、丙各需要10天、12天、15天搬完．现在又知B仓库的货物比A库多25%，开始时甲在A仓库搬运，乙、丙同时在B库搬运货物．搬运了若干天后，丙去帮助甲搬A仓库的货物，正好同时搬完A、B两库的货物．丙帮甲搬了多少天？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4) + 1</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/10) + (1/12) + (1/15)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(9/4) / (1/4)</gadget>
<output>9</output>

<gadget id="calculator">(1/10) * 9</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">(1/10) / (1/15)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>