A pile of coal has a total of 900 tons. If 1/3 of the total is burned, how many tons are left?
一堆煤共900吨，如果烧掉总数的(1/3)，还剩下多少吨吨．
<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">900 * (2/3)</gadget>
<output>600</output>

<result>600</result>