exam Maths Puzzle Numerical Ability

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-2=10b- 3

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This year, 75% of the graduating class of Harriet Tubman School had taken at least 8 math courses. Of the remaining class members, 60% had taken 6 or 7 math courses. What percent of the graduating class had taken fewer than 6 math courses. A bag has yellow marbles and brown marbles. Half of the brown marbles are made of plastic. A marble is selected at random from the bag. What is the probability that it is a brown, plastic marble?