exam Maths Puzzle Numerical Ability

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

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exam Other Question

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? An aircraft descends from an altitude of 1000 feet at the rate 120 feet per minute.

Write a function that represents the altitude of the aircraft after any give number of minutes