A job is done alone. A needs 75 days, and B needs 50 days. During the joint work, A is dismissed with a high profile. In this way, B has worked for a total of 40 days. How many days has A been transferred?
一项工作，单独做，甲需要75天，乙需要50天，合做中，甲有事被高调走，这样乙共工作了40天，问甲调走了多少天？
<gadget id="calculator">1 / 50</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(1/50) * 40</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 75</gadget>
<output>1/75 = around 0.013333</output>

<gadget id="calculator">(1/5) / (1/75)</gadget>
<output>15</output>

<gadget id="calculator">40 - 15</gadget>
<output>25</output>

<result>25</result>