Explanation:
The area of this playing field is its width times its length. The length of the field is:
[tex]L=x+3x+2x=6\text{xft}[/tex]
And its width is 50ft, so the area is:
[tex]A=50ft\cdot6\text{xft}=300\text{xft}^2[/tex]
And we know that the area is 2100 ft², so we can replace that into the expression above and solve for x:
[tex]\begin{gathered} 2100=300x \\ x=\frac{2100}{300}=7 \end{gathered}[/tex]
x = 7
Answer:
The answer is option B. 7
