A barrel of gasoline weighs 50 kilograms, pour out (3/8), how many kilograms are left?
一桶汽油重50千克，倒出(3/8)，还剩下多少千克？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">50 * (5/8)</gadget>
<output>125/4 = around 31.25</output>

<result>125/4 = around 31.25</result>