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Answer :

Let's use the variable "J" to represent the number of posters Jess did, and "G" to represent the number of posters Gabby did.

If they made 20 posters together, we have:

[tex]J+G=20[/tex]

Then, if Jess made 5 posters (that is, J = 5), we can calculate how many posters Gabby did:

[tex]\begin{gathered} 5+G=20 \\ G=20-5 \\ G=15 \end{gathered}[/tex]

So Gabby did 15 posters.

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