Remove (1/4) from (9/20) tons of rice, how many tons are removed, and ((())/(())) remain untransported.
从(9/20)吨大米中运走(1/4)，运走多少吨，还剩((())/(()))未运．
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

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

<gadget id="calculator">(9/20) * (1/4)</gadget>
<output>9/80 = around 0.1125</output>

<result>9/80 = around 0.1125</result>