There is a two-digit number. The ratio of the ones digit to the tens digit is 4:1. Adding 6 to the tens digit makes it equal to the ones digit. What is the two digit number?
有一个两位数，个位上的数和十位上的数的比是4：1，十位上的数加上6，就和个位上的数相等，这个两位数是多少？
<result>28</result>