Answer:
D
Explanation:
x-number of children's tickets sold
y-number of adult's tickets sold
x+y=520=>x=520-y
4.5x+6y=2 707.5
45x+60y=27 075
45(520-y)+60y=27 705
15y+23 400=27 705
15y=3 675
y=245=>x=520-y=520-245=275
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