For a three-digit number, the number in the tens place is twice the number in the hundreds place, the number in the ones place is 4 greater than the number in the hundreds place, and the sum of the numbers in the three places is 12. What is this three-digit number?
一个三位数，十位上的数字是百位上数字的2倍，个位上的数字比百位上的数字大4，三个数位上的数字和是12．这个三位数是多少？
<result>246</result>