For a piece of cloth, (3/10) meters are used for the first time, and (1/10) more meters are used for the second time than the first time, how many meters are shared between the two times.
一块布，第一次用去(3/10)米，第二次比第一次多用去(1/10)米，两次共用去多少米．
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(3/10) + (1/10) + (3/10)</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>