When the digits of a 3-digit number are reversed, its value decreases by 198. The tens digit is two more than the hundreds digit, and the sum of the digits is
15.

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right