When a two-digit number is divided by 7, 8, and 9, the sum of the remainder is 20. Q: What is this two-digit number?
一个两位数分别除以7、8、9，所得余数的和为20．问：这个两位数是多少？
<gadget id="calculator">7 * 9</gadget>
<output>63</output>

<gadget id="calculator">63 - 1</gadget>
<output>62</output>

<result>62</result>