A certain (2/3) is 100 less than 70% of a number, find this number.
某的(2/3)比一个数的70%少100，求这个数．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(7/10) - (2/3)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">100 / (1/30)</gadget>
<output>3_000</output>

<result>3_000</result>