If the decimal point of a decimal is moved one bit to the left, the decimal will be reduced by 2.16. What is the original decimal?
把一个小数的小数点向左移动一位，这个小数就减少了2.16，这个小数原来是多少．
<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">2.16 / (9/10)</gadget>
<output>2.4</output>

<result>2.4</result>