Four empty jars with full jam weigh 600 grams.
One empty jar with full jam weighs 330 grams.
If we subtract the right scale from our doubled left scale, the jam cancels out completely!
That leaves us with three empty jars.
Subtracting 330 from 600 gives us 270 grams.
So, three empty jars weigh 270 grams!
To find the weight of just one empty jar, we simply divide 270 by 3.
270 divided by 3 gives us 90!
That means the weight of one empty jar is 90 grams!
Let’s quickly check our answer to make sure it is 100% correct.
If the empty jar weighs 90 grams, then the full jar on the right scale has 240 grams of jam, because 330 minus 90 is 240.
Half a portion of jam would weigh 120 grams.
On the left scale, we have one empty jar (90 grams) plus a half-full jar (90 plus 120, which is 210 grams).
90 plus 210 equals 300 grams, which matches the left scale perfectly!
Did you get 90 grams as your answer too?
Great job solving this puzzle, and keep practicing to keep your mind sharp!
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