Answer:
Explanation:
Let x=child number
Let y=adult number
so, x+y=143
and 6x+9.5y=1089
Form x+y=143, we got x=143-y
so, 6x+9.5y=1089
will be 6(143-y) +9.5y=1089
then we got y=66
We are looking for adult ticket were sold, so it is 66 tickets.
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