A certain construction site has the following regulations on the wages of migrant workers: every day they work, they will be paid 50 yuan, and they will be suspended for 1 day. A migrant worker earned a total wage of 720 yuan in 20 days. Find the number of days the migrant worker worked.
某建筑工地对民工工资作如下规定：每工作1天，给50元，停工1天，除工钱不给外，还得扣饭费6元．某民工在20天中共得工钱720元，求该民工做工的天数．
<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 720</gadget>
<output>280</output>

<gadget id="calculator">50 + 6</gadget>
<output>56</output>

<gadget id="calculator">280 / 56</gadget>
<output>5</output>

<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<result>15</result>