The grass on the pasture grows at a uniform rate, and each person mows the same amount of grass per day. If a piece of grass is mowed by 17 people, it can be mowed in 30 days; if it is mowed by 19 people, it can be mowed in 24 days. Now it takes 6 days to mow the grass, at least how many people are needed?
草场上的草匀速生长，每人每天的割草量相等．一片草若用17人去割，30天可以割完；若用19人去割，则只需24天就能割完．现在需要6天将草割完，至少要多少个人？
<gadget id="calculator">17 - 9</gadget>
<output>8</output>

<gadget id="calculator">8 * 30</gadget>
<output>240</output>

<gadget id="calculator">240 / 6</gadget>
<output>40</output>

<gadget id="calculator">9 + 40</gadget>
<output>49</output>

<result>49</result>