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This is a supposition question in disguise. I suppose since it is not fixed quantities like no. of legs on an animal or no. of wheels on a vehicle, it becomes difficult to identify it.

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I can only do this by algebra… please someone try to solve this by models.

Let P = number of pencils Phyllis has at first
Let R = number of rulers Phyllis has at first

Now, P + R = 20
=> R = 20 – P

Then, R * 2 = 32 – P
=> (20 – P) * 2 = 32 – P
=> 40 – 2P = 32 – P
=> P = 8

So R = 20 – P = 20 – 8 = 12 #

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