Ah, no. I dont look at the answer unless it really is required, given that i dun even know where to get the answer
Look at the result here and see if it answers your question:
Doesnt it have to be 3, or 6 fives to be divisible by 125? Please GIVE ME A HINT
Wolfram/Alpha's answer is "at least 3 fives, but it could be 4, 5, or 6 fives". The answer it gives is "minimum of 3 fives", which is what you want. Isn't it?