Question

Jess and Gabby are making posters for the school dance. Jess has made 5 posters. Together, they have made 20 posters. How many posters has Gabby made?

Answer 1

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:

`J+G=20`

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

`\begin{gathered} 5+G=20 \\ G=20-5 \\ G=15 \end{gathered}`

So Gabby did 15 posters.