If EG=67, then EF=? There is a picture below
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If Ann cleans in 12 hours then she cleans 
of the apartment per hour. Similarly Liz cleans 
of the appartment per hour. So together then can clean 
of the apartment for hour. Therefor it will take them 
hours to clean.
The general formula
can be used as a check if needed.
The general formula
A stem and leaf plot is a table where each of the data is divided into two parts. The stem, that is the first digit and the leaf is the last digits. Let's say that we have the following set of data.
If we want to make a stem and leaf plot of that data, we first write a column where we place the first digit of each number without repetition, like this:
These are the stems. Now the leaves are the last digit of each number put in order next to the corresponding first digit, like this: