Dongfeng Garment Factory has to make 6,500 pieces of the same tops. According to the previous progress of 195 pieces of tops made by 3 people in 10 days, if it takes 25 days to complete, how many workers are needed to do it at the same time?
东风服装厂要做6500件同样的上衣，按照以往3人10天可做195件上衣的进度，如果要25天完成，需要多少个工人同时做．
<gadget id="calculator">195 / 3 / 10</gadget>
<output>13/2 = around 6.5</output>

<gadget id="calculator">6_500 / (13/2) / 25</gadget>
<output>40</output>

<result>40</result>