Mathematics, 01.01.2020 20:31, person76

Atheatre collected $100 from all the 100 attendees in the audience. the prices of the tickets were $10 for adults, $3 for friends of the theatre, and $0.5 for children. there was at least 1 of each ticket sold. how many adults, friends of theatre, and children were in the audience?

i tried to do this with a matrix, but it didn't work out, so how should i approach this?

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Atheatre collected $100 from all the 100 attendees in the audience. the prices of the tickets were $...