Question 388245
Let n=number of people and x=ticket price.
nx=720
(n-4)(x+2)=720 group price must remain the same.
nx+2n-4x-8=720
n=720/x
720x/x + 2*720/x - 4x - 8 = 720
720 + 1440/x - 4x - 8 = 720
1440/x - 4x - 8 = 0
1440-4x^2-8x=0
4x^2+8x-1440=0
x^2+2x-360=0
(x-18)(x+20)=0
x=18
18+2=$20.00 new ticket price
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Ed