book Maths Puzzle Numerical Ability

6y^2-41y-7
( 6y-1)(y-7)

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a maths exam contained two problems. Problem A was solved by 70% of the students. Problem B was solved by 60%. Every students solved at least one of the problems. Nine students solved both problems. how many students sat the exam? solve:y-3.5y-3=1.8(y+5.5)