The canteen shipped 500 kg of rice, but the amount of flour shipped was less than the rice (7/10), how much less was the amount of flour shipped than the rice?
食堂运来大米500千克，运来的面粉比大米少(7/10)，运来的面粉比大米少多少千克？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">500 * (7/10)</gadget>
<output>350</output>

<result>350</result>