What is the mass of a single red square?

- The mass of a full jar of honey is 1000 grams.
- With half of the honey, the total mass is 600 grams.

**What is the mass of the empty jar in grams?**

What weight will the fourth scale display?

Think carefully! There's a quick and clever shortcut for solving this.

At the end of this course, you'll have a thorough toolbox of algebraic techniques that feel natural to use and empower you to master complex problems and puzzles!

**How many green squares should be placed on the right side of the bottom scale in order to make it balance when released?**

How many red balls need to be added to the right hand side of the bottom scale to put it in balance?

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