Divide 30 kg of fruit juice into three barrels of equal mass. The first barrel weighs (41/3) kilograms, the second barrel weighs (49/3) kilograms, and the third barrel contains all the juice. (1/3), how many kilograms does each empty barrel weigh?
把30千克的果汁分装在三只质量相等的桶中，第一桶连桶重(41/3)千克，第二桶连桶重(49/3)千克，第三桶装了全部果汁的(1/3)，求每只空桶重多少千克？
<gadget id="calculator">41 / 3</gadget>
<output>41/3 = around 13.666667</output>

<gadget id="calculator">49 / 3</gadget>
<output>49/3 = around 16.333333</output>

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

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 * (2/3)</gadget>
<output>20</output>

<gadget id="calculator">(49/3) - 20</gadget>
<output>-11/3 = around -3.666667</output>

<gadget id="calculator">(41/3) + (-11/3)</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>