If the area of the room is 15 square meters, how many square meters are the floor areas of the two kinds of floor tiles

If the area of the room is 15 square meters, how many square meters are the floor areas of the two kinds of floor tiles

Black brick: white brick = 1:2
1+2=3
So black brick is 1 / 3
White brick is 2 / 3
So black brick = 15 times 1 / 3 = 5 square meters
White brick = 15 times 2 / 3 = 10 square meters
(or white brick = 15-5 = 10 square meters)