Mathematics, 18.10.2019 22:30, raekwon12

The family fine arts center charges $21 per adult and $13 per senior citizen for its performances. on a recent weekend evening when 535 people paid admission, the total receipts were $8355. how many who paid were senior citizens?
i am struggling with the right formula to use.
do i use an arthimetic or geometric sequence?

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The family fine arts center charges $21 per adult and $13 per senior citizen for its performances. o...