Let the number of adult tickets be = x
let the number of student tickets be = y
Total tickets are = 414 , equation becomes
[tex]x+y=414[/tex] ........(1)
Given is , the number of student tickets sold was two times the number of adult tickets sold, equation becomes
[tex]y=2x[/tex] .......(2)
So putting the value of y=2x in equation (1).
[tex]x+2x=414[/tex]
[tex]3x=414[/tex]
[tex]x=138[/tex]
As y=2x
[tex]y=2\times138=276[/tex]
Hence number of adult tickets sold were = 138