Using a kind of square brick to pave the floor, there are 360 square bricks, which can pave 40 square meters. If 540 more square bricks are added, what proportion of the floor can we get

Using a kind of square brick to pave the floor, there are 360 square bricks, which can pave 40 square meters. If 540 more square bricks are added, what proportion of the floor can we get

Let X be the total
360 360+540
————=————————
40 X
The solution is x = 100