One wire is (6/15) meters long and (2/15) meters longer than the other wire. How many meters are the two wires in total?
一根铁丝长(6/15)米，比另一根铁丝长了(2/15)米，两根铁丝共长多少米？
<gadget id="calculator">6 / 15</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(2/5) - (2/15)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(4/15) + (2/5)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>