book Maths Puzzle Numerical Ability

Find the sum of the geometric Series: 4,-2,-1/2,.....Answer should be a fraction.

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book Other Question

What are two consecutive even numbers whose sum is 110 and their product is 3021?
I tried x(x=2)=110
and I got 54.

I also tried x(x+2)=3024 Each of the three dimensions of a cube with a volume of y^3 cubic centimeters is decreased by a whole number of centimeters. If the new volume is
y^3-13y^2+54y-72 cubic centimete