And what does the digital screen on the scale say?
It shows a total weight of 150.
This is our very first clue, and it is a very important one.
Since all three pencils look exactly the same, we can safely assume they all have the same weight.
This means we can use a very simple math equation to find the weight of just one pencil.
If three pencils together weigh 150, how much does one single pencil weigh?
We just need to divide the total weight of 150 by the number of pencils, which is 3.
When we divide 150 by 3, we get 50.
So, we have successfully solved our first mystery!
One single yellow pencil weighs exactly 50 units.
Let us write that number down in our mental notebook so we do not forget it.
Now, we are ready to move on to the next scale.
Step 2: Finding the Weight of the Notepad
Let us shift our focus to scale number 2 in the middle.
On this scale, we have a combination of two different items.
We can see one single yellow pencil standing next to a green spiral notepad.
The digital display on this second scale shows a total weight of 350.
At first, this might look hard because we have two different objects.
But remember, we already know the secret weight of the yellow pencil!
We just calculated that one pencil weighs exactly 50.
This means that the weight of the pencil plus the weight of the green notepad equals 350.
To find the weight of the notepad alone, we just need to do a simple subtraction.
We start with the total weight of 350.
Then, we subtract the weight of the pencil, which is 50.
Subtracting 50 from 350 gives us exactly 300.
Isn’t that amazing?
We now know that the green notepad has a weight of 300 units.
We are making incredibly fast progress, and the final answer is just around the corner!
Let us take a moment to appreciate how easy math can be when we break it down.
Now, let us look at the final clue.
Step 3: Revealing the Weight of the Scissors
Finally, let us look at scale number 3 on the right side.
On this scale, we see the same green spiral notepad.
But this time, there is a pair of blue scissors lying right on top of it.
The scale shows a combined weight of 450.
This is the moment we have all been waiting for!
We need to find the weight of the blue scissors.
And just like before, we already have the key to unlock this final door.
We know from our previous step that the green notepad weighs 300.
So, the weight of the notepad plus the weight of the scissors is equal to 450.
To find the weight of the scissors, we just need to subtract the notepad’s weight from the total weight.
We take the total weight of 450.
Then, we subtract the weight of the notepad, which is 300.
Subtracting 300 from 450 leaves us with exactly 150.
And there we have it!
The weight of the scissors is exactly 150 units.
Conclusion: You Did It!
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