Super difficult puzzles
It is said that the person who answered correctly has an IQ of 140. Among the 8 gold coins, 6 are real and 2 are counterfeit. The real coins are each 50g, and the counterfeit coins are 60g and 40g. There is a scale without scales and weights. Weigh it only 4 times to find out which coin is the counterfeit and know which one is heavier and which one is lighter.
Replies (5)
I did some logical reasoning problems from the elementary school Olympiad in math... It turns out that everyone in our class scored 140... At that time, I was also very puzzled by a problem with two measuring cylinders, one 5 ml and one 7 ml, and we had to measure 6 ml of water.
— All replies loaded —