bus has only (2/5) seats filled with passengers, if there are 10 more passengers, the ratio of the number of seats taken to the number of empty seats is 3:2. How many seats are there in this bus?
一辆公交车只有(2/5)的座位坐了乘客，如果乘客再增加10人，则已坐的座位数与空座位数的比是3：2．这辆公交车共有多少个座位？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>