The transportation team transports a batch of flour, all (3/7) are transported in the first time, and all (1/3) are transported in the second time, it is known that 21 tons are transported in the first time, how many tons are transported in the second time ?
运输队运一批面粉，第一次运走全部的(3/7)，第二次运走全部的(1/3)，已知第一次运走21吨，第二次运走多少吨？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">21 / (3/7)</gadget>
<output>49</output>

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

<gadget id="calculator">49 * (1/3)</gadget>
<output>49/3 = around 16.333333</output>

<result>49/3 = around 16.333333</result>