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

1 answer

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.