Answer:
![B =120](https://img.qammunity.org/2022/formulas/mathematics/high-school/o0vxjhl049qctqc5kboen2k89kf9jylcb1.png)
Explanation:
Given
Represent Kitchen with K and Bedroom with B.
So:
![K = 50ft^2](https://img.qammunity.org/2022/formulas/mathematics/high-school/myhjka54dl785r4jh286nmmg2mfpxicvxp.png)
--- 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
![K = 10 + (1)/(3)B](https://img.qammunity.org/2022/formulas/mathematics/high-school/9djm7dhu9ws5ke2xcr2areu5p3vq9qol8j.png)
![50 = 10 + (1)/(3)B](https://img.qammunity.org/2022/formulas/mathematics/high-school/49o3mt63gaqeimof5jg379hun1lm0jrfj1.png)
Multiply through buy 3
![3 * 50 = 3 * 10 +(1)/(3)B * 3](https://img.qammunity.org/2022/formulas/mathematics/high-school/kre6yz0yp3rqzzdjxo4hv0m51sc37vwmiz.png)
![150 = 30 +B](https://img.qammunity.org/2022/formulas/mathematics/high-school/utvaqh8823qvd5ysw5ft7ne8kb212vwf4f.png)
Make B the subject
![B =150 - 30](https://img.qammunity.org/2022/formulas/mathematics/high-school/9vwmcg6e2n6feeugtzbe4hlfirqngt2eoc.png)
![B =120](https://img.qammunity.org/2022/formulas/mathematics/high-school/o0vxjhl049qctqc5kboen2k89kf9jylcb1.png)
Hence, the area of the bedroom is 120ft^2