There are three 3 digit numbers such that the digits 1,2,3...8,9 are used once each to write them. They are found to be in the ratio 1:3:5
Find all such possible triplets.

The only way to use the nine digits in the ratio 1:3:5 is the triplet 129 387 645. The first number must be between 100 and 200, else the third number would be greater than 999. Am I missing something here??