(3/8) of a bunch of watermelons is exactly 450 kilograms. If (1/4) of it is sold, how many kilograms are left?
一堆西瓜的(3/8)正好是450千克，如果卖出它的(1/4)，还剩下多少千克？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">450 / (3/8)</gadget>
<output>1_200</output>

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

<gadget id="calculator">1_200 * (1/4)</gadget>
<output>300</output>

<result>300</result>