There are two wires. The first one is 28 meters long, which is 2.2 meters longer than the second one. How long is the second one?
有两根电线，第一根长28米，比第二根的3倍多2.2米，第二根长多少米？
<gadget id="calculator">28 - 2.2</gadget>
<output>25.8</output>

<gadget id="calculator">25.8 / 3</gadget>
<output>8.6</output>

<result>8.6</result>