exam Maths Puzzle Numerical Ability

A company just starting business made the following four inventory purchases in June:
June 1 150 units $ 780
June 10 200 units 1,170
June 15 200 units 1,260
June 28 150 u

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exam Other Question
Given a group of books consisting entirely of 28 hardbacks and 52 paperbacks. Of the paperbacks, 33 are fiction and 8 are non-fiction. There are a total of 40 nonfiction. Of the to 4w-1(3w+6)-w-1(3)=w-1(w+2)