What is the main challenge presented to the protagonist by the Emperor?
TED-ED: Can you solve the counterfeit coin riddle? - Jennifer Lu

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Mathematics
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9th - 10th Grade
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To negotiate a peace treaty with a neighboring kingdom
To solve a complex mathematical equation
To identify a counterfeit coin among twelve using a balance scale
To escape the dungeon using a secret passage
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many coins are initially placed on the balance scale in the first weighing?
Eight coins
Four coins
Two coins
Twelve coins
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What should be done if the first two piles on the scale do not balance?
Mark the heavier side with a minus and the lighter side with a plus
Mark the heavier side with a plus and the lighter side with a minus
Mark all coins with zeros
Remove all coins and start over
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of reassembling the piles after the initial weighings?
To remove ambiguity and identify the counterfeit coin
To ensure all coins are weighed equally
To make the process more challenging
To confuse the Emperor
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If the previously heavier side becomes lighter after substitution, what does it indicate?
The remaining plus coin is the counterfeit
The scale is malfunctioning
The remaining minus coin is the counterfeit
One of the three minus coins moved is the counterfeit
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