Let the digit at the unit place be x. So, the digit at the ten place 15 - x. The difference between two digits of the two digit numbers = 3 x−(15−x)=3 x−15+x=3 2x=18 x=9 The first number x = 9 Digit at the ten’s place = 15 - 9 = 6 The product of the two digit number = 9 × 6 = 54 (other than those given as options)