A box of ocean balls, first take out 168, and then take out the rest (2/3). At this time, the remaining ocean balls in the box are exactly (1/7) of the total number of ocean balls in the original box. Ask this box How many ocean balls are there?
一箱海洋球，先拿出168个，又拿出剩下的(2/3)，这时箱子里剩下的海洋球恰好是原来这箱海洋球总数的(1/7)，问这箱海洋球原来有多少个？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">168 * (2/3)</gadget>
<output>112</output>

<gadget id="calculator">168 - 112</gadget>
<output>56</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (2/3) - (1/7)</gadget>
<output>4/21 = around 0.190476</output>

<gadget id="calculator">56 / (4/21)</gadget>
<output>294</output>

<result>294</result>