Mind Bender # 4 : Balancing Act

There’s been some good feedback so far on these Mind Benders – so, let’s see how you go with this one.

You’ll find it has just one solution – which is so elegantly simple.

Anyhow, here’s your next challenge

You have been given 10 bags full of coins – each coin weighing 10 grams.

All the coins look the same, but the coins in one bag actually weigh one gram less than those in the other nine bags.

You have a single set of scales … but are allowed to perform only one weighing. How do you find out which bag contains the lighter coins?