Xiao Ming has an 18cm pencil. He used (1/3) in the first week and (1/4) in the second week.
小明有一枝18厘米的铅笔，第一周用去(1/3)，第二周用去(1/4)，两周一共用去多少厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18 * (1/3)</gadget>
<output>6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">18 * (1/4)</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">6 + (9/2)</gadget>
<output>21/2 = around 10.5</output>

<result>21/2 = around 10.5</result>