You have to solve this as system
Let x be a general admission ticket
Let y be an upper reserved ticket
{x+y=676 Multiply by (-6.5)
{6.5x+8y=4902.5
{-6.5x-6.5y=-4394
{6.5x+8y= 4902.5
-6.5y+8y=507.5
1.5y/1.5=507.5/1.5
y=338.33
Substitute x in y
x+338.33=676
x=676-338.33
x= 337.667
So the general admission tickets= 337.677
And the upper reserved tickets= 338.33
Hope that helps :)
-Asmaa Ghazzawi