exam Maths Puzzle Numerical Ability

I need find the inverse of the following function:
f(x)=2(x+12).

This is not from a test

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exam Other Question

A maintenance crew requires between 30 min and 45 min to prepare an aircraft for its next flight. How many aircraft can this crew prepare for flight in a 6-hour period of time? Solve for X: (3x/x+2)+(7/x-2)=3