Answer:
a. 24
Step-by-step explanation:
[tex]n,\ n+2,\ n+4-\text{first three consecutive even numbers}\\\\\text{The equation:}\\\\n+(n+2)+(n+4)=78\\\\3n+6=78\qquad\text{subtract 6 from both sides}\\\\3n=72\qquad\text{divide both sides by 3}\\\\n=24[/tex]
