The difference between A and B is 20, and A's (1/5) is equal to B's (1/6), so what is A's number?
甲、乙两数相差20，甲的(1/5)和乙的(1/6)相等，那么甲数是多少．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">20 * (1/6)</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(10/3) / (1/30)</gadget>
<output>100</output>

<result>100</result>