exam Maths Puzzle Numerical Ability

Please help with (9a/4b)^0. Is it 9a/4b or 1?

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exam Other Question

Adult tickets for a play cost $4 and child tickets cost $1. If there were 23 people at a performance and the theater collected $80 from ticket sales, how many children attended the play? Thanks again!!!!
Solve by addition. If a unique answer does not exist, state whether it is inconsistent or dependant. McGraw Hill. 6th editon. 8.2. #12.
2x+3y=1
5x+3y=16