If 3 < x <100, for how many values of x is x/3 the square of a prime number?
two
three
four
five
nine
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It is known that no more than 7 children will be attending a party. What is the smallest number of cookies that must be brought to the party so that each child receives the same number of cookies?
If a is a positive integer, and if the units’ digit of a2 is 9 and the units’ digit of(a+1)2is 4, what is the units’ digit of(a+2)2 ?
A circular rim 28 inches in diameter rotates the same number of inches per second as a circular rim 35 inches in diameter. If the smaller rim makes x revolutions per second, how many revolutions per minute does the larger rim make in terms of x?
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From 1987 to 1988 a sporting goods store's sales doubled. From 1988 to 1989 the store's sales doubled again. By what percent did sales increase from 1987 to 1989?
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