A three-digit number has the sum of its digits equal to 12, its hundreds digit is twice its units digit, and it exceeds the number formed b…

Explanation

The difference of the number and its reverse is 99 × (hundreds − units) = 198, so hundreds − units = 2; with hundreds = 2 × units this gives units = 2 and hundreds = 4, and the tens digit is 12 − 6 = 6.