Zhang, Wang, and Li used 14 tons, 11 tons, and 17 tons of water respectively in January, and they had to pay a water fee in total. So what fraction of a yuan should the Zhang family pay?
张、王、李三家一月份用水分别是14吨、11吨和17吨，总共要付水费a元．那么张家应付a元的几分之几？
<gadget id="calculator">14 + 11 + 17</gadget>
<output>42</output>

<gadget id="calculator">14 / 42</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>