exam Maths Puzzle Numerical Ability

Here is the question: ESP Experiment: Cards with 5 different symbols. In this experiment the "sender" draws randomly a card and concentrates on it. The "receiver" tries to determin

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The supplementary angle is 15 degrees less than 4 times the complementary angle. Find the angle.

In the office, we have come up with two different solutions: 55 degrees and 39 degrees.

Which one is right? (x)/(x^2+9x+20) - (4)/(x^2+7x+12) I am having trouble with this problem.

Thanks for any help
Rhee