A window cleaner has enough supplies to clean 21 windows per office building on a certain number of buildings. They can also clean the windows of a school with 42 windows. Altogether, there are
Let's represent the number of office buildings as "x."
The total number of windows cleaned in the office buildings is given by 21*x.
The number of windows in the school is given as 42.
Therefore, the total number of windows altogether is 21*x + 42.
21 windows per office building and there are a certain number of buildings, so the total number of office windows cleaned is 21 * number of buildings
The total number of windows cleaned is 21 * number of buildings + 42 windows for the school
21 * number of buildings + 42 = total windows cleaned. Answer: \boxed{21 \cdot \text{number of buildings} + 42}.
To find the total number of windows, you need to know the number of windows in each office building and the number of office buildings. Let's call the number of office buildings "x".
The number of windows in each office building is given as 21.
So, the total number of windows in the office buildings is 21 * x.
Additionally, there is a school with 42 windows.
Therefore, the total number of windows is 21x + 42.
Note: This answer assumes that there is only one school and the number of office buildings is the same for all scenarios; however, the exact number of buildings is not provided in the question.