exam Maths Puzzle Numerical Ability

Adult tickets for a play cost $6 and child tickets cost $1. If there were 32 people at a performance and the theater collected $117 from ticket sales, how many children attended the play?

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exam Other Question

The graph of the function f(x)=1/x is shown below. Find the equation and graph the function g(x) which is the reflection of f(x)in the y-axis. The graph has to curves in quadrant 1 and 3. I don;t know how to do this and am looking for help with this. I am not getting this can someone please help me with these two questions, if possible can you explain each step so that I understand how you get to the answer.
Use the functions