A wire is used up (3/10) meters, and there is still (7/10) meters left, what is the original length of this wire
一根铁丝用去(3/10)米，还剩(7/10)米，这根铁丝原来长多少米
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(3/10) + (7/10)</gadget>
<output>1</output>

<result>1</result>