The second flight of stairs is two times as high as the first flight of stairs. Together they are 60 feet high, how high is the first flight of stairs.

x + 2x = 60

3x = 60
x = ?

To find the height of the first flight of stairs, let's assume that the height of the first flight is "x" feet.

Given that the second flight is two times as high as the first flight, we can say that the height of the second flight is "2x" feet.

Together, the height of both flights is 60 feet. So, we can write the equation:

x + 2x = 60

Simplifying the equation, we have:

3x = 60

To solve for x, divide both sides of the equation by 3:

x = 60 / 3

x = 20

Therefore, the height of the first flight of stairs is 20 feet.