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Maths Puzzle
Numerical Ability
Sales reduction force a factory to cut back its output by 20%. By what percent must the reduced sales be increased to allow production to be brought back to normal?
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i dont understand this thank you verymu44ch
[(2+3) power of 2 -4.5}+7
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?