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A new car was sold with new brake linings that were each 0.250 inch thick. After the car had been driven 50,000 miles without replacing any brake linings, the thinnest brake lining was 0.085 inch thick. What was the percent decrease in the thickness of the thinnest brake lining?
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Jena has a jar that contains 8 nickels and 12 dimes and no other coins. If she adds nickels to the jar one at a time until the ratio of the number of nickels to the total number of coins in the jar is 4 to 5, how many nickels must she add?
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In 1994 the average annual salary of maintenance workers at Company X was approximately what percent of the average annual salary of maintenance workers nationwide in Country A ?
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If Company X employed a total of 200 maintenance workers annually for the years 1991 through 1993 and a total of 150 maintenance workers annually for the years 1994 through 1997, what was the average amount of money spent annually by Company X on the salaries of its maintenance workers for the years 1991 through 1997 ?
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For the years 1991 through 1997, what was the ratio of the range of the average annual salaries of maintenance workers at Company X to the range of those nationwide in Country A ?
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In the xy-plane, the graph of y=(2x+3)(x-5) crosses the y-axis at the point (0,k). What is the value of k ?
_____
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A, F, M, P, Y
If the 5 letters listed above were randomly ordered, what is the probability that the resulting list would be either in alphabetical order (as shown) or in reverse alphabetical order?
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When positive integer n is divided by 4, the remainder is 2. When n is divided by 3, the remainder is 1. Which of the following statements must be true?
Indicate all such statements.
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In the xy-plane, line k and line p intersect at 90-degree angles. If the slope of line k is $$\frac{1}{2}$$, what is the slope of line p ?
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The figure shows a regular 9-sided polygon inscribed in a circle with center O.
Quantity A:
The perimeter of the regular polygon
Quantity B:3 times the perimeter of triangle OAB
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x > y
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Set S consists of all possible values of the product ab, where a and b are integers such that 0< a< b < 10.
Quantity A:The number of odd integers in S
Quantity B:The number of even integers in S
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n is a positive integer.
Quantity A:The remainder when $$(n+7)^{2}-49$$ is divided by n
Quantity B:1
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$450, $760, $900, $1,000, $1,250, $1,400, $1,750, $2,000
The eight amounts listed are the reported bonuses earned by eight employees during July. Two of the reported amounts are in error: one is $250 greater than the actual amount and one is $250 less than the actual amount.
Quantity A:The standard deviation of the amounts of the eight reported bonuses
Quantity B:The standard deviation of the amounts of the eight actual bonuses
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The median of 5 different positive integers is 12.
Quantity A:
The least possible sum of the 5 integers
Quantity B:
42
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0 < w < x < y < z
The average (arithmetic mean) of w, x, y, and z is less than the median of w, x, y, and z.
Quantity A:z-y
Quantity B:x-w
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If the average (arithmetic mean) price of 3 items is $20 and the average price of 2 other items is $10, what is the average price of all 5 items?
$_____
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Sixty percent of the people who originally auditioned for parts in a musical were excused, and the rest were asked to audition again. Of those who were asked to audition again, 30 percent, or 18 people, were hired. How many people originally auditioned for parts?
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r and n are integers such that r≥4 and n≥4. If (r-3)(n-3)<5, what is the greatest possible value of n ?
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