Answer:

Explanation:
Given
Represent Kitchen with K and Bedroom with B.
So:

--- 10 more than 1/3 of Bedroom area
Required
Determine the bedroom area
The expression of K and B has been determined above.
The next step is to substitute 50 for K in the second equaion


Multiply through buy 3


Make B the subject


Hence, the area of the bedroom is 120ft^2