(1/6) of a number is 25 less than its (1/5), find this number.
一个数的(1/6)比它的(1/5)少25，求这个数．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) - (1/6)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">25 / (1/30)</gadget>
<output>750</output>

<result>750</result>