Search found 156 matches
@tutorphd: Yes, I did plug in values and got different answers each time which is what made me stop. But after translating the problem into an equation, I couldn't think further.
Thanks for the solution! I understand the problem better now.
- by kartikshah
Fri Jul 27, 2012 7:22 pm- Forum: Problem Solving
- Topic: Work/Time
- Replies: 5
- Views: 1885
- by kartikshah
Fri Jul 27, 2012 6:32 pm- Forum: Problem Solving
- Topic: Probability
- Replies: 4
- Views: 889
- by kartikshah
Fri Jul 27, 2012 6:30 pm- Forum: Problem Solving
- Topic: Lead in a race
- Replies: 4
- Views: 1236
There must be a trick because I found this problem on the free resources section of one of the GMAT test Prep companies.
I did the long math but I wasn't convinced that it would be an efficient way to approach the problem; this is why I post it here for alternative solutions.
- by kartikshah
Fri Jul 27, 2012 6:27 pm- Forum: Problem Solving
- Topic: How many positive integers between 200 and 300 (both inclusi
- Replies: 3
- Views: 2087
I didn't get why you subtracted 648/900 from 1
When we say
d1 = 8 ways to choose; doesn't that include 7
d2 = 9 ways to choose; doesn't that include 7
d3 = 9 ways to choose; doesn't that include 7
?
Please explain.
- by kartikshah
Fri Jul 27, 2012 6:22 pm- Forum: Problem Solving
- Topic: Probability
- Replies: 4
- Views: 889
- by kartikshah
Fri Jul 27, 2012 6:14 pm- Forum: Problem Solving
- Topic: 3 digit integers
- Replies: 2
- Views: 1393
How many positive integers between 200 and 300 (both inclusi
How many positive integers between 200 and 300 (both inclusive) are not divisible by 2, 3 or 5?
A. 3
B. 16
C. 75
D. 24
E. 26
- by kartikshah
Fri Jul 27, 2012 6:12 pm- Forum: Problem Solving
- Topic: How many positive integers between 200 and 300 (both inclusi
- Replies: 3
- Views: 2087
Radius of Circle
What is the radius of the circle that circumscribes the triangle, measure of whose sides is 9, 40 and 41?
A. 20
B. 20.5
C. 4
D. 8
E. 45
- by kartikshah
Fri Jul 27, 2012 6:11 pm- Forum: Problem Solving
- Topic: Radius of Circle
- Replies: 3
- Views: 1280
Probability
What is the probability that a 3-digit positive integer picked at random will have one or more "7" in its digits? A. 271/900 B. 27/100 C. 7/25 D. 1/9 E. 1/10 Apart from providing solution to the above question, could someone guide me to a good resource on probability, permutations and comb...
- by kartikshah
Fri Jul 27, 2012 6:07 pm- Forum: Problem Solving
- Topic: Probability
- Replies: 4
- Views: 889
Lead in a race
In a 100m race, Sam beats John by 4 seconds. On the contrary, if Sam allowed John to start 16m ahead of Sam, then Sam and John reach the finishing point at the same time. How long does Sam take to run the 100m race? A. 4 seconds B. 25 seconds C. 29 seconds D. 21 seconds E. 6.25 seconds Please help w...
- by kartikshah
Fri Jul 27, 2012 6:05 pm- Forum: Problem Solving
- Topic: Lead in a race
- Replies: 4
- Views: 1236
Class of Students
In a class of 50 students, 10 did not opt for math. 15 did not opt of science and 2 did not opt for either. How many students of the class opted for both math and science? A. 37 B. 25 C. 23 D. 27 E. 48 I don't have the OA for this one too!! But my working showed D to be the right answer. Is D correct?
- by kartikshah
Fri Jul 27, 2012 6:00 pm- Forum: Problem Solving
- Topic: Class of Students
- Replies: 3
- Views: 930
Inequality with Modulus
What range of values of x will satisfy the inequality |2x + 3| > |7x - 2|? A. x < (-1/9) or x > 5 B. -1 < x < (1/9) C. (-1/9) < x < 1 D. (-1/9) < x < 5 E. x < (-1/9) or x > 1 I don't have the OA for this question. But my working showed A to be correct. Can someone confirm this to be the correct answ...
- by kartikshah
Fri Jul 27, 2012 5:59 pm- Forum: Problem Solving
- Topic: Inequality with Modulus
- Replies: 5
- Views: 1039
Work/Time
If Dave works alone he will take 20 more hours to complete a task than if he worked with Diana to complete the task. If Diana works alone, she will take 5 more hours to complete the complete the task, then if she worked with Dave to complete the task? What is the ratio of the time taken by Dave to t...
- by kartikshah
Fri Jul 27, 2012 5:57 pm- Forum: Problem Solving
- Topic: Work/Time
- Replies: 5
- Views: 1885
3 digit integers
What is the sum of all 3 digit positive integers that can be formed using the digits 1, 5, and 8, if the digits are allowed to repeat within a number? A. 126 B. 1386 C. 3108 D. 308 E. 13986 My working: 3 spots: d1, d2, d3 d1 = 3 ways d2 = 3 ways d3 = 3 ways total 27 ways in which number can be made ...
- by kartikshah
Fri Jul 27, 2012 5:55 pm- Forum: Problem Solving
- Topic: 3 digit integers
- Replies: 2
- Views: 1393
@ EAGLEEYE: Yep! It's clearer now. Thanks for the added explanation on how zeroes could have been removed to leave the average unaffected! I hadn't thought about that.
- by kartikshah
Fri Jul 27, 2012 5:10 pm- Forum: Problem Solving
- Topic: Number Properties
- Replies: 7
- Views: 4555