The reciprocal after the decimal point of number A is moved two places to the left has a ratio of 7 (1/7) to number B. What is the original ratio of number A to number B?
甲数的小数点向左移动两位后的倒数，与乙数的比值是7(1/7)，甲数与乙数原来的比值是多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>