Search found 115 matches
When was the order filled?
On Monday morning a certain machine ran continuously at a uniform rate to fill a production order. At what time did it completely fill the order that morning?
1) The machine began filling the order at 9:30 am
2) The machine had filled 1/2 of the order by 10:30am and 5/6 of the order by 11:10am
- by LulaBrazilia
Mon Mar 17, 2014 8:34 am- Forum: Data Sufficiency
- Topic: When was the order filled?
- Replies: 3
- Views: 1713
- by LulaBrazilia
Mon Mar 17, 2014 8:31 am- Forum: Data Sufficiency
- Topic: Is xy > 5?
- Replies: 2
- Views: 1574
Probability that X and Y solve
Xavier, Yvonne, and Zelda each try independently to solve a problem. If their individual probabilities for success are 1/4, 1/2, and 5/8, respectively, what is the probability that Xavier and Yvonne, but not Zelda, will solve the problem?
A) 11/8
B) 7/8
C) 9/64
D) 5/64
E) 3/64
- by LulaBrazilia
Mon Mar 17, 2014 8:30 am- Forum: Problem Solving
- Topic: Probability that X and Y solve
- Replies: 5
- Views: 4690
Resistors connected in parallel
In an electric circuit, two resistors with resistances x and y are connected in parallel. In this case, if r is the combined resistance of these two resistors, then the reciprocal of r is equal to the sum of the reciprocals of x and y. What is r in terms of x and y? A) xy B) x+y C) 1/(x+y) D) xy/(x+...
- by LulaBrazilia
Mon Mar 17, 2014 8:28 am- Forum: Problem Solving
- Topic: Resistors connected in parallel
- Replies: 5
- Views: 2997
- by LulaBrazilia
Tue Mar 11, 2014 7:04 pm- Forum: Data Sufficiency
- Topic: what is the value of x^2 - y^2?
- Replies: 2
- Views: 1358
is y greater than 75?
If y is greater than 110 percent of x, is y greater than 75?
1) x > 75
2) y-x = 10
- by LulaBrazilia
Tue Mar 11, 2014 7:03 pm- Forum: Data Sufficiency
- Topic: is y greater than 75?
- Replies: 4
- Views: 2269
Which n would raise average to 55?
For the past n days, the average (arithmetic mean) daily production at a company was 50 units. If today's production of 90 unites raises the average to 55 units per day, what is the value of n?
A) 30
B) 18
C) 10
D) 9
E) 7
- by LulaBrazilia
Tue Mar 11, 2014 7:01 pm- Forum: Problem Solving
- Topic: Which n would raise average to 55?
- Replies: 7
- Views: 3979
Probability of selecting siblings
A certain junior class has 1,000 students and a certain senior class has 800 students. Among these students, there are 60 sibling pairs, each consisting of 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a ...
- by LulaBrazilia
Tue Mar 11, 2014 7:00 pm- Forum: Problem Solving
- Topic: Probability of selecting siblings
- Replies: 2
- Views: 5876
Number properties - how do I even start?
Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
1) 31 < p < 37
2) p is odd
- by LulaBrazilia
Mon Mar 10, 2014 5:42 pm- Forum: Data Sufficiency
- Topic: Number properties - how do I even start?
- Replies: 7
- Views: 6629
What is wz?
If w+z = 28, what is the value of wz?
1) w and z are positive integers.
2) w and z are consecutive odd integers.
- by LulaBrazilia
Mon Mar 10, 2014 5:40 pm- Forum: Data Sufficiency
- Topic: What is wz?
- Replies: 2
- Views: 1392
y is what percent of x?
If m > 0 and x is m percent of y, then, in terms of m, y is what percent of x?
A) 100m
B) 1/100m
C) 1/m
D) 10/m
E) 10,000/m
- by LulaBrazilia
Mon Mar 10, 2014 5:39 pm- Forum: Problem Solving
- Topic: y is what percent of x?
- Replies: 4
- Views: 1791
What is median - average?
If m is the average (arithmetic mean) of the first 10 positive multiples of 5 and if M is the median of the first 10 positive multiples of 5, what is the value of M-m?
A) -5
B) 0
C) 5
D) 25
E) 27.5
- by LulaBrazilia
Mon Mar 10, 2014 5:37 pm- Forum: Problem Solving
- Topic: What is median - average?
- Replies: 4
- Views: 3248
If x = 0.rstu what is x?
If x = 0.rstu, where r, s, t, and u each represent a nonzero digit of x, what is the value of x?
1) r = 3s = 2t = 6u
2) The product of r and u is equal to the product of s and t
- by LulaBrazilia
Sun Mar 09, 2014 6:38 pm- Forum: Data Sufficiency
- Topic: If x = 0.rstu what is x?
- Replies: 2
- Views: 1504
Is sqrt(n+k) > 2*sqrt(n)?
If n and k are positive integers, is sqrt(n+k) > 2*sqrt(n)?
1) k > 3n
2) n+k > 3n
- by LulaBrazilia
Sun Mar 09, 2014 6:36 pm- Forum: Data Sufficiency
- Topic: Is sqrt(n+k) > 2*sqrt(n)?
- Replies: 2
- Views: 3981
Grouping researchers
Of the 50 researchers in a workgroup, 40 percent will be assigned to team A and the remaining 60 percent to team B. However, 70 percent of the researchers prefer team A and 30 percent prefer team B. What is the lowest possible number of researchers who will NOT be assigned to the team they prefer? A...
- by LulaBrazilia
Sun Mar 09, 2014 6:34 pm- Forum: Problem Solving
- Topic: Grouping researchers
- Replies: 7
- Views: 6333