book Maths Puzzle Numerical Ability

If a 17-ft. ladder is leaning against a building. The base of the ladder is 7 feet from the base of the building. How high up the side of the building is the top of the ladder?

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Reduce the fraction 6x/12x. Would this be 1/2? this year, 75% of the graduating class of Harriet Tubman High School had taken at least 8 math courses. Of the remaing class members, 60% had taken 6 or 7 math courses.What percent of the graduating class had taken fewer than 6 math courses?????