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.

Answer 1

Let's assume the number of office buildings is x.
The number of windows in the office buildings is 21*x.
So the number of windows cleaned in the office buildings and the school is 21*x + 42.
According to the information given, this is equal to 126.
So, we can write the equation 21*x + 42 = 126.
The equation to solve this problem algebraically is 21x + 42 = 126.