Question: A three-digit number may be expressed as 100h + 10t + u where h is the hundreds digit, t is the tens digit, and u is the units digit (for example, 345 = 100(3) + 10(4) + 5). For a certain three-digit number, the sum of the digits is 18; the tens digit is equal to the sum of the other two; and if the digits are reversed, the new number is 99 less than the original number. Find the number.