Is it overweight to load 6 machines weighing 700 kg on a truck weighing 4 tons? How much overload?
在一辆重4吨的货车上，装6台重700千克的机器，超重了吗？超载了多少？
<gadget id="calculator">700 / 1_000</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">6 * (7/10)</gadget>
<output>21/5 = around 4.2</output>

<gadget id="calculator">(21/5) - 4</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>