Answer:
Adult =$7------x
Child=$4-------y
Total Tickets= 565= $2920
7x+4y = 2920
x+y= 565
x=565-y
7(565-y) + 4y= 2920
3955 - 7y +4y= 2920
-3y=2920-3955
y=1035/3= 345
x= 565-345= 220
child= 345
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