There are 8 balls and they all weight the same amount except one of them is heavier than the others. Can you find out which one is heavier with only using the balance scale twice?
Can you get it without checking the answer? Which is hidden here:
Updated with right answer: Set two balls to the side and weigh three balls on one side and three balls on the other. If one side is heavier than the other take the heavier side and set one of the balls to the side and weigh the other two against each other. If they are the same then the ball you set aside is heavier. Otherwise if the 6 balls weighed the same then take the two you set aside and weigh them against each other and take the heavier one.