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Problem 1The median of the list
is
. What is the mean?
Problem 2A number
is
more than the product of its reciprocal and its additive inverse. In which interval does the number lie?
Problem 3The sum of two numbers is S.Suppose
is added to each number and then each of the resulting numbers is doubled. What is the sum of the final two numbers?
Problem 4What is the maximum number for the possible points of intersection of a circle and a triangle?
Problem 5How many of the twelve pentominoes pictured below have at least one line of symmetry?
Problem 6Let
and
denote the product and the sum, respectively, of the digits of the integer
. For example,
and
. Suppose
is a two-digit number such that
. What is the units digit of
?
Problem 7When the decimal point of a certain positive decimal number is moved four places to the right, the new number is four times the reciprocal of the original number. What is the original number?
Problem 8Wanda, Darren, Beatrice, and Chi are tutors in the school math lab. Their schedule is as follows: Darren works every third school day, Wanda works every fourth school day, Beatrice works every sixth school day, and Chi works every seventh school day. Today they are all working in the math lab. In how many school days from today will they next be together tutoring in the lab?
Problem 9The state income tax where Kristin lives is levied at the rate of
of the first
of annual income plus
of any amount above
. Kristin noticed that the state income tax she paid amounted to
of her annual income. What was her annual income?
Problem 10If
,
, and
are positive with
,
, and
, then
is
Problem 11Consider the dark square in an array of unit squares, part of which is shown. The first ring of squares around this center square contains
unit squares. The second ring contains
unit squares. If we continue this process, the number of unit squares in the
ring is
Problem 12Suppose that
is the product of three consecutive integers and that
is divisible by
. Which of the following is not necessarily a divisor of
?
Problem 13A telephone number has the form
, where each letter represents a different digit. The digits in each part of the numbers are in decreasing order; that is,
,
, and
. Furthermore,
,
, and
are consecutive even digits;
,
,
, and
are consecutive odd digits; and
. Find
.
Problem 14A charity sells
benefit tickets for a total of
. Some tickets sell for full price (a whole dollar amount), and the rest sells for half price. How much money is raised by the full-price tickets?
Problem 15A street has parallel curbs
feet apart. A crosswalk bounded by two parallel stripes crosses the street at an angle. The length of the curb between the stripes is
feet and each stripe is
feet long. Find the distance, in feet, between the stripes?
Problem 16The mean of three numbers is
more than the least of the numbers and
less than the greatest. The median of the three numbers is
. What is their sum?
Problem 17Which of the cones listed below can be formed from a
sector of a circle of radius
by aligning the two straight sides?
Problem 18The plane is tiled by congruent squares and congruent pentagons as indicated. The percent of the plane that is enclosed by the pentagons is closest to
Problem 19Pat wants to buy four donuts from an ample supply of three types of donuts: glazed, chocolate, and powdered. How many different selections are possible?
Problem 20A regular octagon is formed by cutting an isosceles right triangle from each of the corners of a square with sides of length
. What is the length of each side of the octagon?
Problem 21A right circular cylinder with its diameter equal to its height is inscribed in a right circular cone. The cone has diameter
and altitude
, and the axes of the cylinder and cone coincide. Find the radius of the cylinder.
Problem 22In the magic square shown, the sums of the numbers in each row, column, and diagonal are the same. Five of these numbers are represented by
,
,
,
, and
. Find
.
Problem 23A box contains exactly five chips, three red and two white. Chips are randomly removed one at a time without replacement until all the red chips are drawn or all the white chips are drawn. What is the probability that the last chip drawn is white?
Problem 24In trapezoid
,
and
are perpendicular to
, with
,
Problem 25How many positive integers not exceeding
are multiples of
or
but not
?
Problem 1The median of the list
Problem 2A number
Problem 3The sum of two numbers is S.Suppose
Problem 4What is the maximum number for the possible points of intersection of a circle and a triangle?
Problem 5How many of the twelve pentominoes pictured below have at least one line of symmetry?
Problem 6Let
Problem 7When the decimal point of a certain positive decimal number is moved four places to the right, the new number is four times the reciprocal of the original number. What is the original number?
Problem 8Wanda, Darren, Beatrice, and Chi are tutors in the school math lab. Their schedule is as follows: Darren works every third school day, Wanda works every fourth school day, Beatrice works every sixth school day, and Chi works every seventh school day. Today they are all working in the math lab. In how many school days from today will they next be together tutoring in the lab?
Problem 9The state income tax where Kristin lives is levied at the rate of
Problem 10If
Problem 11Consider the dark square in an array of unit squares, part of which is shown. The first ring of squares around this center square contains
Problem 12Suppose that
Problem 13A telephone number has the form
Problem 14A charity sells
Problem 15A street has parallel curbs
Problem 16The mean of three numbers is
Problem 17Which of the cones listed below can be formed from a
Problem 18The plane is tiled by congruent squares and congruent pentagons as indicated. The percent of the plane that is enclosed by the pentagons is closest to
Problem 19Pat wants to buy four donuts from an ample supply of three types of donuts: glazed, chocolate, and powdered. How many different selections are possible?
Problem 20A regular octagon is formed by cutting an isosceles right triangle from each of the corners of a square with sides of length
Problem 21A right circular cylinder with its diameter equal to its height is inscribed in a right circular cone. The cone has diameter
Problem 22In the magic square shown, the sums of the numbers in each row, column, and diagonal are the same. Five of these numbers are represented by
Problem 23A box contains exactly five chips, three red and two white. Chips are randomly removed one at a time without replacement until all the red chips are drawn or all the white chips are drawn. What is the probability that the last chip drawn is white?
Problem 24In trapezoid
Problem 25How many positive integers not exceeding