A cement pile is 2m above the water surface, the length in the water accounts for 2/5 of the total length, and the length in the water is 1m longer than that in the mud. How many meters is the total length of this pile?
一根水泥桩露出水面2m，在水中的占全长的(2/5)，水中的比泥中的多1m，这根桩全长多少米？
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

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

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

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

<result>5</result>