A certain bus departs from the starting station, and (1/5) passengers get off at the next stop, and at the same time, 5 passengers get on the bus, so there are 2 more passengers than before. How many passengers are there in this bus? passenger?
某公交车从起点站出发，到下一站有(1/5)的乘客下车，同时又有5名乘客上车，这样就比原来多了2名乘客，这辆公交车原有多少名乘客？
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / (1/5)</gadget>
<output>15</output>

<result>15</result>