exam Maths Puzzle Numerical Ability

I am trying to figure out (h) in the following problem. A=1/2h(B+b) where as A=80, B=12, and b=8. I have tried it and come up with h=80 but when i plug the number back in it does not balance out. Please help

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exam Other Question

How do i simplify the rational expression x^2+7x+12 / x^2+9x+20 Find the equation of the line that contains (2,-5) and is
1. perpendicular to the line y=5/2x-4
2. parallel to the line y=2/3x+2