exam Maths Puzzle Numerical Ability

PLEASE HELP!!!
Need to make at least 12 helicopters and at least 20 airplanes per month.
Limit on number of helicopters to (no more than) 72 per month
Can sell helicopters for 3

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exam Other Question
How do you convert an equation like 2^-1 c^-4 d^2 into an equation with only positive exponents? What is the difference between domain and range? Describe a real life situation that could be modeled by a function