book Maths Puzzle Numerical Ability

How do i do this problem

(1/2y^2 z+ 3/4yz-1/8z^2)+(3/4y^2 z+3/4yz+z^2)

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book Other Question

A deliver truck has a load of 840 items you ordered. If it takes1 1/2 minutes to unload a dozen of items , how long will it take to unload all of them?
I got 70 min by dividing 12 Solve and check the equation 9(b - 4) -7b = 5(3b - 2)