book Maths Puzzle Numerical Ability

a certain rectangle has lengths that are twice its width. the perimeter of this rectangle is 72 centimeters. this rectangle actually represents a drawing of the size of a planned v

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book Other Question
find the constant of variation k.

m varies directly with n; m=144 when n=8 write the equation of the given conics in standard form via completion of the square:
1) Y^2-12X-8X+20=0
2) 16X^2-16Y^2-4X-28Y+66=0

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