A: 454585

The first two digits are the product of 9 x 5

The third and 4th digits are the product of 9 x (the other 5)

The 5th and 6th digits are 45 + 45 – middle digit = 90 – 5 = 85

The first two digits are the product of 9 x 5

The third and 4th digits are the product of 9 x (the other 5)

The 5th and 6th digits are 45 + 45 – middle digit = 90 – 5 = 85