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GMAT Exam
At a certain used-book store, the cost of each paperback book is x dollars and the cost of each hardcover book is y dollars. What is the cost of a hardcover book at the store?
(1)
At the store, the cost of 3 paperback books and 5 hardcover books is $12.25.
(2)
At the store, the cost of 9 paperback books and 15 hardcover books is $36.75.
If n and K are positive integers and n+ k< 8, how many different values of the product nk are possible?
For any data set, the proportion of data that lies within A" standard deviations of its mean is at least 1 - -K. The scores on a spelling test taken by 64 students have a mean of 74.0 and a standard deviation of 6.0. If t\$ the number of students who have scores greater than 62 and less than 86, and t\s as small as possible, what is the value of t?