A car drives from place A to place B. It travels 200 kilometers in the morning and 250 kilometers in the afternoon. There is still (1/10) left to go. How many kilometers are there between places A and B?
一辆车从甲地开往乙地，上午行了200千米，下午行了250千米，还剩(1/10)没行，甲乙两地相距多少千米？
<gadget id="calculator">200 + 250</gadget>
<output>450</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">450 / (9/10)</gadget>
<output>500</output>

<result>500</result>