exam Maths Puzzle Numerical Ability

x=9
y=x+0.5z
z=x+y
a=x+y+z
a=?

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exam Other Question

[(x^2-4)/(x^2+3x-10)] / [(x^2+5x+6)/(x^2+8x+5)]
Please help with this word problem.

The demand equation for a certain type of printer is given by
D = -200p + 35000
The supply equation is predicted to be
S = -p^2 + 400p - 20000

Find the equilibrium price.

Thanks!!