The rice has 80 kilograms, and the flour is less than the rice (3/4), how many kilograms is the flour?
大米有80千克，面粉比大米少(3/4)，面粉有多少千克？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

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

<result>20</result>