2 merchants are meeting..merchant A and merchant B A: how old are your 3 daughters ? B: if you add their ages they are 13... if you multiplay their ages you get my own age. A: well i need to know your age then B shows him without any commentary his passport where A can read the age. A: thats all good.. but to clearly solve this i need more information B: my oldest daughter plays the harp. A: ok, now its all clear to me.
Although we don't know what the multiple is, we do know the guy still isn't sure. Therefore the multiple must leave us with more than one option. The only one doing so is 36, so we can narrow it down to either 9, 2 and 2 or 6, 6 and 1.
That's were the last hint comes in. The harp isn't important, but there is an eldest one. That means we can eliminate 6, 6 and 1 leaving us with 9, 2 and 2 as the correct ages.
@FreeLilly Anyone who sees that I have deleted my comments, it is so that someone else can attempt Lilly's riddle. I stumbled across the answer, more by luck than intelligence, still trying a get my head around the important piece of information I was missing to fully explain to the poster how it works. Good luck! 🤍