exam Maths Puzzle Numerical Ability

A carpenter used 30 ft of molding in three pieces to trip a garage door. If the long piece was 2 ft longer than twice the length of each shorter piece then how long was each piece?

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The ratio of greens to blues was 2 to 1, and twice the sum of the number of blues and the number of whites exceeded the number of greens by 10. If there were 35 blues, greens, and whites in all, how many were there of each color? Find the equation of a quadratic polynomial passing through the following points: (-1,2) (-5,2) and (6,8)?