The difference between the number A minus the number B is 20% of the sum of the numbers A and B. If the number A is 6, what is the number B?
甲数减去乙数的差，是甲、乙两数的和的20%，如果甲数是6，那么乙数是多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">6 * (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">6 - (6/5)</gadget>
<output>24/5 = around 4.8</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(24/5) / (6/5)</gadget>
<output>4</output>

<result>4</result>