exam Maths Puzzle Numerical Ability

Simplify the product : (x/2-2/5)(2/5-x/2)-x^2+2x

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exam Other Question

For a group of boxes all of the same girth (2x height + 2x width), the volume V varies directly as the length L.
If a box in the group has length of 30in., what is its volume? (x-4)/2 -1/5 = (7x +1)/20