exam Maths Puzzle Numerical Ability

Well, im just having a problem getting the General idea.
Do i combine the Measure of Angle A and B in the problem to = 90?
or do i use one to find the other?
Thanks in Advance

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exam Other Question
Terry had 60 emplyees.20% were drivers,1/3 were messengers .25 worked in the office . The rest were mangers. How many were mangers? Solve fir r: r with the exponent of 2 + 5r - 14 = 0