What is the weight of the empty jar?

At first glance, it might look a bit tricky, but don’t worry at all.

We are going to break it down together step by step!

First, let’s observe what we see on the right scale.

On the right side, there is one full jar of jam sitting on the scale.

The scale shows a total weight of 330 grams.

This means one empty jar plus a full amount of jam inside equals 330.

Now, let’s look at the left scale.

On the left side, we have two items together.

There is one completely empty jar, and one jar that is half-full of jam.

Together, they weigh 300 grams on the scale.

So, how can we use these clues to find the answer?

Let’s think about what the items actually consist of.

The left scale has two empty glass jars in total.

It also has half a portion of jam.

So, two empty jars plus half a portion of jam equal 300 grams.

Now, let’s double everything on the left scale to make things super clear!

If we double two empty jars, we get four empty jars.

If we double half a portion of jam, we get one full portion of jam.

And if we double the total weight of 300 grams, we get 600 grams!

So, four empty jars plus one full portion of jam equal 600 grams.

Now, remember what we learned from the right scale earlier?

One empty jar plus one full portion of jam weighs exactly 330 grams.

Do you see the magic happening here?

Let’s compare our new equation with the right scale!

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