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 enough supplies to clean 126 windows how many office buildings can be washed? Identify the equation that would be used to solve this problem algebraically
Let's represent the number of office buildings as "x".
The number of windows in each office building is given as 21, therefore the total number of windows in the office buildings is 21x.
The total number of windows, including the school, is given as 126.
So, we can set up the equation:
21x + 42 = 126