Q; 23 which two weights need to be swapped to balance the scales
problem; I think that this problem is about measurements and numbers
clarify: [nothing to be clarified] e.g
find the picture: swap 2 weights so both sides weigh the same
1. I added both sides to see how much each side weighed. I found that the left side weighed 15kg and the Right side weighed 12kg.
2. I used trial and error by swapping 4kg and 5kg. I found that the Left side now weighed 17kg and the Right side weighed 11kg.
3. This obviously was not correct.
4. I then swapped 9kg with 7kg. The Left side now weighs 14kg and the Right side weighs 14kg. Both sides now balance.
Summary: The strategy i used was guess check and improve
another problem solved by buzzbee 🙂