Column calculation: the quotient of (7/20) divided by (5/7) minus (1/3) of (9/20), what is the difference?
列式计算：(7/20)除以(5/7)的商减去(9/20)的(1/3)，差是多少？
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(7/20) / (5/7)</gadget>
<output>49/100 = around 0.49</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(9/20) * (1/3)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(49/100) - (3/20)</gadget>
<output>17/50 = around 0.34</output>

<result>17/50 = around 0.34</result>