You are a 3 digit number my 100 digit is 5 greater than the 10th digit am a multiple of 7 one of my digit is 5 but am not divisible by 5 what is the number?

Hi The answer is 504 pls hw do u arrive at this? You get this answer by working out that 100 didgit is going to be 5 more than the 10 didgit and 1 of the of them is 5 so if you had the 100 didgit as 5 that would mean the 10 didgit would be 0 so you have 50_ and you find out which number starts with 50_ and is a multiple or 7