To find the width (breadth) of a square house with a total area of 1000 square feet and a length of 20 feet, you can use the formula for the area of a square:

Area = Length Width

Since it's a square, the length and width are equal, so you can set them both to the same variable, let's call it "x."

So, the equation becomes:

1000 square feet = 20 feet x

Now, solve for x:

x = 1000 square feet / 20 feet x = 50 feet

The width (breadth) of the square house is 50 feet.