Answer :

Let x be the number of stamps.

After a month the number of stamps doubled, this is expressed as 2x

Then, the equation described by the problem is:

[tex]\begin{gathered} 2x=120 \\ \Rightarrow x=60 \end{gathered}[/tex]

Therefore, the initial number of stamps is 60.

The third option is the correct one. 2x=120

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