We are given two unknown variables P and U packages.
We can see that Leslie has to unpack P packages at work
However, after she had unpacked U number, she stopped.
To first subtract U from P because we were told that U number had been unpacked from P packages which was supposed to be unpacked.
This can be represented mathematically as P-U
Next, we would have to find the percentage of packages not yet unpacked and this would be:
Unknown Variable
This refers to an undefined variable which has not yet been disclosed and remain unknown until a value is given to them.
Read more about unknown variables here:
https://brainly.com/question/2133551
