For a three-digit number, the sum of the numbers in each digit is 15, the number in the hundreds place is 5 greater than the number in the tens place, and the number in the ones place is three times the number in the tens place, then what is the three-digit number?
一个三位数，各数位上的数字和是15，百位上的数字比十位上的数字大5，个位上的数字是十位上数字的3倍，则这个三位数是多少？
<result>726</result>