You have 12 coins, six weigh 24 grams and six weigh 25 grams. You also have the broken scale from Five Weights and a Broken Scale
Sort the 12 coins into the group of 24g coins and the group of 25g coins using that broken scale no more than 9 times.
It's a broken scale, you can't solve this because you cannot weigh the coins correctly with a broken scale.
(Ed Mekler my brain buddy solved on phone inadvertently).