Search found 30 matches
number prop
How many different prime numbers are factors of the positive integer n?
1. 4 different prime number ae factors of 2n
2. 4 different prime numbers are facors of n^2
- by teejaycrown
Fri Nov 23, 2012 12:21 am- Forum: Problem Solving
- Topic: number prop
- Replies: 3
- Views: 1124
combinatorics
A certain stock exchange designates each stock with a one, two, or three letter code where each letter is selected from the 26 letters of the alphabet. if the letters may be repeated and if the same letters used in different order constitute a different code, how many different stocks is it possible...
- by teejaycrown
Fri Nov 23, 2012 12:18 am- Forum: Problem Solving
- Topic: combinatorics
- Replies: 2
- Views: 1070
- by teejaycrown
Sat Nov 10, 2012 6:29 am- Forum: Problem Solving
- Topic: Number properties
- Replies: 1
- Views: 903
number line
if n denotes a number to the left of 0 in the number line such that the square of n is less than the 1/100, then the reciprocal of n must be
a < -10
b between -1 and - 1/10
c. between -1/10 and 0
d between 0 and 1/10
e. > 10
- by teejaycrown
Fri Nov 02, 2012 10:55 pm- Forum: Problem Solving
- Topic: number line
- Replies: 1
- Views: 910
combination
To finish a room in a model home, an interior decorator is to select 2 chairs, 2 tables from a collection of chairs and tables in a warehouse that are all different from each other. If there are 5 chairs inthe warehouse and if 150 different combinations are possible, how many tables are in the wareh...
- by teejaycrown
Fri Nov 02, 2012 10:51 pm- Forum: Problem Solving
- Topic: combination
- Replies: 2
- Views: 1428
units and tens
Whats the tens digit of the positive integer r?
1. The tens digit of r/10 is 3
2. The hundreds digits of 10r is 6
- by teejaycrown
Fri Nov 02, 2012 10:48 pm- Forum: Problem Solving
- Topic: units and tens
- Replies: 1
- Views: 854
factoring
if x and y are positive integers what is the value of x and y
1. The greatest common factor of x and y is 10
2. The LCM of x and y is 180
- by teejaycrown
Fri Nov 02, 2012 10:40 pm- Forum: Problem Solving
- Topic: factoring
- Replies: 2
- Views: 1261
function
For which of the follwoing functions f is f(x) = f (1 - x) for all x?
a. F(x) = 1 -x
b. f(x) = 1 - x ^2
c. f(x) = x^2 - (1-x)^2
d. f(x) = x^2 (1-x^2)
e. f(x) = x/1-x
- by teejaycrown
Fri Nov 02, 2012 10:35 pm- Forum: Problem Solving
- Topic: function
- Replies: 2
- Views: 802
sequence
If each term in the sum a1+a2+a3........+an is either 7 or 77 and the sum equals 350 which of the following could be equal to n?
a. 38
b. 39
c. 40
d. 41
e. 42
- by teejaycrown
Fri Nov 02, 2012 10:32 pm- Forum: Problem Solving
- Topic: sequence
- Replies: 2
- Views: 1044
Percentages
What was the % increase in the population of city k from 1980 to 1990
1. in 1970 the population of city k was 160,000
2. In 1980, the population of city k was 20 % greater than it was in 1970 and in 1990 the population of city k was 30% greater than it was in 1970
- by teejaycrown
Fri Nov 02, 2012 10:23 pm- Forum: Problem Solving
- Topic: Percentages
- Replies: 1
- Views: 2217
- by teejaycrown
Fri Nov 02, 2012 10:13 pm- Forum: Problem Solving
- Topic: Number Prop
- Replies: 1
- Views: 830
distance
During a 40 mile trip, Marla traveled at an average speed of x miles/hour for the first y miles of the trip at an average speed of 1.25x miles/hr for the last 40-y miles of the trip. The time that Marla took to travel the 40 miles was what % of the time it would have taken her if she had travelled a...
- by teejaycrown
Fri Nov 02, 2012 10:10 pm- Forum: Problem Solving
- Topic: distance
- Replies: 2
- Views: 1159
Mixture problems
Three grades of milk are 1%, 2% and 3% fat by volume.If x gallons of the 1% grade, y gallons of the 2% grade and z gallons of 3% grade aew mixed to give x+y+z gallons of a 1.5% grade, what is x in terms of y and z.
a. y+3z
b.y+z/4
c. 2y + 3z
d. 3y +z
e. 3y + 4.5z
- by teejaycrown
Fri Nov 02, 2012 10:05 pm- Forum: Problem Solving
- Topic: Mixture problems
- Replies: 1
- Views: 844
Percentages
What fraction of this years graduating students at a certain college are males
1. of this year graduating students, 33% of the males and 20% of the females transferred from another college
2. Of this year graduatiing students, 25% transferred from another college.
- by teejaycrown
Fri Nov 02, 2012 9:57 pm- Forum: Problem Solving
- Topic: Percentages
- Replies: 1
- Views: 807
Number Prop
Of the 60 animals on a certain farm, 2/3 are either pigs or cows, how many animals are cows
1. The farm has more than twice as many cows as it has pigs
2. The farm has more than 12 pigs
- by teejaycrown
Fri Nov 02, 2012 9:54 pm- Forum: Problem Solving
- Topic: Number Prop
- Replies: 1
- Views: 922