The difference between (1/4) and (1/8) is multiplied by (2/7), and the product obtained is divided by (3/4). What is the quotient?
(1/4)与(1/8)的差乘(2/7)，所得的积除以(3/4)，商是多少？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) - (1/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(2/7) / (3/4)</gadget>
<output>8/21 = around 0.380952</output>

<gadget id="calculator">(1/8) * (8/21)</gadget>
<output>1/21 = around 0.047619</output>

<result>1/21 = around 0.047619</result>