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24-02-2021
Mathematics

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Algebra Explained how you can tell that 20 pens/ 2 packages = 30 pens/ 3 package using mental math.

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loreal33 loreal33

24-02-2021

Because when simplified, both equal 10/pens/1 package.

Also consider:

20/2 = 10
30/3 = 10

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