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

Answer 1

cleaned with the available supplies?

Let's assume the number of office buildings is x.
Therefore, the number of windows in all the office buildings is 21x.
Since there is also a school with 42 windows, the total number of windows is 21x + 42.
Given that there are enough supplies to clean 126 windows, we can write the equation 21x + 42 = 126.
Subtracting 42 from both sides of the equation, we get 21x = 126 - 42 = 84.
Dividing both sides of the equation by 21, we get x = 84/21 = 4.
Therefore, there are 4 office buildings that can be cleaned with the available supplies.