The cafeteria bought 800 kilograms of flour, and the rice it bought was 50 kilograms less than the flour (3/4). How many kilograms of rice did it buy?
食堂买来面粉800千克，买来的大米比面粉的(3/4)还少50千克，买来大米多少千克？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">800 * (3/4)</gadget>
<output>600</output>

<gadget id="calculator">600 - 50</gadget>
<output>550</output>

<result>550</result>