If the number 6 is written after the single digit of a number, the new number obtained is 6000 more than the original number. What is the original number.
如果把数字6写在一个数的个位数字后面，得到的新数比原数增加了6000．原来的数是多少．
<gadget id="calculator">6_000 - 6</gadget>
<output>5_994</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">5_994 / 9</gadget>
<output>666</output>

<result>666</result>