The perimeter of a circular fountain is 62.8 meters, and a railing is placed 2 meters away from the edge of the pool. How many meters is the railing?
一个圆形喷水池的周长62.8米，在离水池边2米的外面围上栏杆．栏杆长多少米？
<gadget id="calculator">62.8 / 3.14</gadget>
<output>20</output>

<gadget id="calculator">20 + 2 + 2</gadget>
<output>24</output>

<gadget id="calculator">3.14 * 24</gadget>
<output>75.36</output>

<result>75.36</result>