On the eve of the Spring Festival, a kind-hearted man rescued some beggars. At the beginning, he gave each beggar 100 yuan, but the remaining 350 yuan, he decided to give each beggar an extra 20 yuan. At this time, after hearing the news, 5 more beggars came. If each of them got the same amount of money as other beggars, the kind person would have to spend another 550 yuan. How many beggars were there?
春节前夕有位好心人救助一些乞丐．一开始他给每位乞丐100元，结果剩下350元，他决定每人多给20元．这时闻讯又赶来了5位乞丐．如果他们每人拿到的钱与其他的乞丐一样多，这位好心人还要再拿出550元．原来有多少位乞丐？
<gadget id="calculator">100 + 20</gadget>
<output>120</output>

<gadget id="calculator">120 * 5</gadget>
<output>600</output>

<gadget id="calculator">600 - 550</gadget>
<output>50</output>

<gadget id="calculator">350 - 50</gadget>
<output>300</output>

<gadget id="calculator">300 / 20</gadget>
<output>15</output>

<result>15</result>