exam Maths Puzzle Numerical Ability

An architect designs a house that is 12 m wide. The rafters holding up the roof are equal in length and meet at an angle of 70 degrees. The rafters extend 0.3 m beyond the supporting wall. How long are the rafters?

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six years ago, bob was four times as old as mary. in four years he will be twice as old as mary. hoq old are they now What is the slope of a line that is perpendicular to the line that passes through the points (4,7) and (9,3)?

A. -4/5 B. -5/4 C. 4/5 D. 5/4