Answer:
A. n; n - 7, 5n
Step-by-step explanation:
[tex]n\to first\ number\\n-7\to secon\ number\\5n\to third\ number\\73\to the\ sum\ of\ numbers\\\\\text{The equation:}\\\\n+(n-7)+(5n)=73\qquad\text{combine like terms}\\\\(n+n+5n)-7=73\qquad\text{add 7 to both sides}\\\\7n=80\qquad\text{divide both sides by 7}\\\\n=\dfrac{80}{7}\\\\n=11\dfrac{3}{7}\\\\n-7=11\dfrac{3}{7}-7=4\dfrac{3}{7}\\\\5n=5\cdot\dfrac{80}{7}=\dfrac{400}{7}=57\dfrac{1}{7}[/tex]
