After (1/3) of 3 tons of cement is used, then (1/3) ton is used, how many tons are used in total?
3吨水泥用去了(1/3)后，再用去(1/3)吨，一共用去多少吨．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<result>4/3 = around 1.333333</result>