This is the second weighing quiz.
You are a legendary thief.
You got 9 identical gold bars.
One of these is a fake, heavier than the rest.
Spot the fakes using just two arm scales.
Again, a number is attached to each gold bar.
Then compare the weight of the three.
Let’s compare gold bars 1, 2, 3 and 4, 5, and 6.
There are three cases.
1. When the same 2. When the right side is larger 3. When the left side is larger
1. In the same case (123=456), compare 7 and 8.
If 7 and 8 are equal, then 9 is fake (7=8<9)
If 7 is heavier, 7 is fake (7>8=9)
If 8 is heavier, then 8 is fake (8>7=9).
2. If the right side is larger, compare 4 and 5. (123<456)
If 4 is large, 4 is fake, and if 5 is large, 5 is fake.
If the two are equal, then 6 is fake.
It's the same way as before.
The important thing is to be able to think in three parts.
Comparison of large-small relationships is a type that we constantly encounter while doing mathematics.
Actively thinking using major-small relationships will help you gain confidence
in solving major-small relationship problems in mathematics
that you will continue to encounter in the future.
Now, if you have 12 gold bars, how do you find a fake using only 3 gold bars?
Have fun thinking.
This is a YouTube video link.