exam Maths Puzzle Numerical Ability

This question is from a homework assignment (#3) from University of Calgary. Winter of 2007.

4e+1g=-4+4f
-1e+2g=-13+4f
3e-4g=18+1f

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exam Other Question

The capacity of an elevator is 20 children or 15 adults. If 12 children are in the elevator, how many adults can get in? Determine if 18x^2 - 54x + 45 is factorable, if so factor it.