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How to divide from both sides of an equation | Linear equations | Algebra I | Khan Academy

July 26, 2012
by
Khan Academy
YouTube video player
How to divide from both sides of an equation | Linear equations | Algebra I | Khan Academy

TL;DR

By removing two-thirds of the objects on both sides of a balanced scale, it is determined that each mystery object has a mass of 3 kilograms.

Transcript

So we have our scale again. And we've got some masses on the left hand side and some masses on the right hand side. And we see that our scale is balanced. We have the same total mass on the left hand side that we have on the right hand side. Instead of labeling the mystery masses as question mark, I've labeled them all x. And since they all have an... Read More

Key Insights

  • 🙃 The mystery masses on both sides of the scale are labeled as x and have equal masses.
  • 🙃 Removing two-thirds of the masses on both sides results in a balanced scale.
  • 💆 Each mystery object has a mass of 3 kilograms.
  • 💆 The concept of keeping the scale balanced is crucial in determining the mass of the mystery objects.
  • 💄 The number of mystery masses is unknown, making it challenging to directly remove or determine their individual masses.
  • 💆 Multiplying the total mass on each side by 1/3 helps find the mass of one mystery object.
  • ⚖️ Balancing the scale by removing two-thirds of the masses leads to the conclusion that x is equal to 3 kilograms.

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Questions & Answers

Q: What is the challenge in determining the mass of each mystery object?

The challenge is that the mystery masses are labeled as x and their individual masses are unknown.

Q: How can one find the mass of each mystery object?

By removing two-thirds of the masses on both sides of the scale, the scale remains balanced, and it can be concluded that each mystery object has a mass of 3 kilograms.

Q: What happens if only one mystery mass is left on the left-hand side?

If only one mystery mass is left on the left-hand side, it would have the same mass as the total mass on the right-hand side.

Q: Why can't two mystery masses be removed from the right-hand side?

Removing two mystery masses from the right-hand side would unbalance the scale since the individual mass of each mystery mass is unknown.

Summary & Key Takeaways

  • A balanced scale has mystery masses labeled as x on both sides.

  • The goal is to find the mass of each mystery object.

  • By removing two-thirds of the masses on each side, it is discovered that x is equal to 3 kilograms.


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