Move the decimal point of a number two places to the left, and the resulting number is 4.158 less than the original number. How much is this number?
把一个数的小数点向左移动二位，所得的数比原数少4.158．这个数原来是多少．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">4.158 / 99</gadget>
<output>0.042</output>

<gadget id="calculator">0.042 * 100</gadget>
<output>4.2</output>

<result>4.2</result>