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?
weigh 3 against 3 if even, weigh the last pair 1 against 1 if one side is heavier, take the 3 on the heavier side and weigh 1 against 1, putting the last 1 aside heavier side is the answer or if they are even, the remaining 1 of the 3
weigh 3 against 3
ReplyDeleteif even, weigh the last pair 1 against 1
if one side is heavier, take the 3 on the heavier side and weigh 1 against 1, putting the last 1 aside
heavier side is the answer or if they are even, the remaining 1 of the 3