How much is 45 tons reduced by 10%.
45吨减少10%后是多少．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">45 * (1/10)</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">45 - (9/2)</gadget>
<output>81/2 = around 40.5</output>

<result>81/2 = around 40.5</result>