A bricklayer has 9 bricks. 8 bricks weigh the same amount, but one brick is slightly heavier than the rest. The bricklayer wants to find the heavy brick. He has a balance scale. How can he find the heavy brick in only two weighings? Answer at bottom of post.
I just got home about 20 minutes ago from my first brick day (week 7 on training schedule). For those of you who don't know what a brick day is, it's basically a workout where the bike to run transition in a race is being simulated. Today I had to do my 20km bike, hop off the bike and get right into the run for 5km.
The bike went as usual, I got through it without too many problems. So right after the bike, I quickly got off the bike and started my run and.....my legs felt exactly like bricks, hence the "brick day" term (a little factoid for all of you). My quads just felt numb. But probably 1km into the run I got legs back and from there it was basically the same as a normal 5km run. My time for the run was for the most part the same as usual, maybe 20-30 seconds slower?
Overall, it wasn't too bad and I guess it can only get better from here on out.
Answer:
He should divide the bricks into 3 groups of 3. He then weighs 2 sets of 3 bricks against each other. If they balance, the heavy brick is in the group that was set aside. If they do not balance, he then takes the group that was heaviest. He has 3 bricks left. He takes the 2 bricks from the 3 and weighs them against each other. If they balance, the heavy brick is the one which is set aside. If they do not balance, the scale will show which is the heavier brick
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