If the dividend in a division formula is reduced by 20% and the divisor is increased by 25%, how much is the quotient of the division formula reduced compared to the quotient of the original division formula?
如果把一个除法算式中的被除数减少20%，除数增加25%，这时的除法算式所得商比原来除法算式的商减少了多少．
<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">10 * (4/5)</gadget>
<output>8</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">5 * (5/4)</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">8 / (25/4)</gadget>
<output>32/25 = around 1.28</output>

<gadget id="calculator">2 - (32/25)</gadget>
<output>18/25 = around 0.72</output>

<gadget id="calculator">(18/25) / 2</gadget>
<output>9/25 = around 0.36</output>

<result>9/25 = around 0.36</result>