A certain city organizes a group of volunteers, among whom (4/5) can speak foreign languages, and later added 5 volunteers (all of whom can speak foreign languages), and now volunteers who can speak foreign languages account for (5/6). How many volunteers are there in total?
某市组织一批志愿者，其中能讲外语的占(4/5)，后来又增加5名志愿者(都能讲外语)，现在能讲外语的志愿者占(5/6)，现在这批志愿者共有多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 * (4/5)</gadget>
<output>4</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(5/6) - (4/5)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / (1/30)</gadget>
<output>30</output>

<result>30</result>