(2/3) of number A is equal to (1/5) of number B, how much less is number A than number B?
甲数的(2/3)与乙数的(1/5)相等，甲数比乙数少百分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) / (2/3)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) / 1</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>