There are 8 pills . They are all of the same size and colour . One pill weighs slightly more and is poisonous . You have a balanced scale and can only use it twice . How can you find the poisonous pill ?
You have eight balls all of the same size . 7 of them weigh the same , and one of them weighs slightly more . How can you find the ball that is heavier by using a balance and only two weighings ?