In a particular house,the bedrooms take up 1/3 of the total floor area, and the living room takes up another 1/5.If the rest of the house has an area of 700 square feet,find the area of the living room and area devoted to bedrooms.
Although you have not clearly asked a question, let x = total area.
1/3 x + 1/5 x = x - 700
Once you find x, calculate the appropriate fractions of x.
I hope this helps.