Search found 16 matches
- by mchaubey
Mon May 10, 2010 6:41 pm- Forum: Problem Solving
- Topic: Divisibility and Prime Factoring
- Replies: 6
- Views: 1310
C is correct but Why couldn't it be 5
The total volume of cylinder with diameter 5 and height 8 would be 157
and volume of the box will be 5*4*8= 160
- by mchaubey
Thu May 06, 2010 6:22 pm- Forum: Problem Solving
- Topic: Biggest Cylinder in a Box
- Replies: 4
- Views: 1953
Mrs T's Bonus Question
When Mrs. T's students answer the bonus question correctly, she awards a bonus. If the base score is between 10 and 99, the bonus is equal to 2 times the tens digit in the base score. The last test Mrs. T scored was between 10 and 99, and the student answered the bonus question correctly. Was the bo...
- by mchaubey
Thu May 06, 2010 1:04 pm- Forum: Data Sufficiency
- Topic: Mrs T's Bonus Question
- Replies: 3
- Views: 1605
Biggest Cylinder in a Box
A large rectangular box is 4 feet wide, 5 feet long, and 8 feet tall. A metal cylinder is to be fitted snugly into the box and stood upright on its base, resting on any one of the 6 sides of the box. Of all such cylinders that could fit into the box, what is the diameter, in feet, of the one that ha...
- by mchaubey
Thu May 06, 2010 12:55 pm- Forum: Problem Solving
- Topic: Biggest Cylinder in a Box
- Replies: 4
- Views: 1953
Simplifying S2:
x^2+ y^2 + 2xy= x^2+ y^2 -2
thus 2xy= -2
therefor xy=-1
Sufficient
(x+1)/y= (y+1)/x
=>x(x+1)= y(y+1)
=>x^2+x= y^2+y
Not Suff.
Thus B
- by mchaubey
Thu May 06, 2010 10:36 am- Forum: Data Sufficiency
- Topic: Inequality
- Replies: 3
- Views: 1152
Here S1 says k has 27 factors thus sufficient
While S2 says k has prime factors r and s thus possible factors are 1, r, s, k only four factors
So which one is correct?
- by mchaubey
Thu May 06, 2010 10:31 am- Forum: Data Sufficiency
- Topic: S1 and S2 Contradicting each other
- Replies: 3
- Views: 922
S1 and S2 Contradicting each other
How many positive integer factors does k have?
(1) k has the same number of positive integer factors as 3^3.
(2) k = rs, where r and s are different prime numbers.
- by mchaubey
Thu May 06, 2010 10:30 am- Forum: Data Sufficiency
- Topic: S1 and S2 Contradicting each other
- Replies: 3
- Views: 922
Hi Liferocks: Actually the question is: 2/x + 2/y = 6, but if you simplify this stm, you'll get x + y = 3xy, so stm1 is the same as the question, so it s not suficient. Am I wrong? Stm2: Staritng from x + y = 3xy (simplified from question stem), if x = y, then for x=-2, y=2, the stm is false, if th...
- by mchaubey
Wed May 05, 2010 8:46 am- Forum: Data Sufficiency
- Topic: DS ISSUE
- Replies: 5
- Views: 1276
A. I did it by picking 1 as my initial number. 1-3/4 = 1/4 left after first pass 3/4 * 1/4 = 3/16 --> 1/4 - 3/16 = 1/16 after second pass 1/16 * 3/4 = 3/64 --> 1/16 - 3/64 = 1/64 left after third pass how much removed in total = 1 - 1/64 = 63/64 = A I or got to do the last step there and was gettin...
- by mchaubey
Wed May 05, 2010 8:42 am- Forum: Problem Solving
- Topic: Mineral Extracted
- Replies: 5
- Views: 1523
Mineral Extracted
If 3/4 of the mineral deposits in a reservoir of water are removed every time a water filtration unit completes a cycle, what fraction of the total minerals present in the water will have been removed after 3 complete filtration cycles?
a. 63/64
b.25/32
c. 13/16
d. 9/32
e. 1/62
- by mchaubey
Wed May 05, 2010 7:49 am- Forum: Problem Solving
- Topic: Mineral Extracted
- Replies: 5
- Views: 1523
- by mchaubey
Wed May 05, 2010 7:19 am- Forum: Data Sufficiency
- Topic: DS ISSUE
- Replies: 5
- Views: 1276
Faster way to solve this problem
Of the 3 digit intergers greater than 700, how many have 2 digits that are equal to each other and the remaining digit different from the other 2?
1. 90
2. 82
3. 80
4. 45
5.. 36
Got the answer but took a long time any faster way to do the same.
Thanks,
- by mchaubey
Sat May 01, 2010 12:03 pm- Forum: Problem Solving
- Topic: Faster way to solve this problem
- Replies: 4
- Views: 1181
Integer or not
If the integers v and w are both positive, is v/w an integer? (1) For every factor n of w, n is also a factor of v. (2) For every prime factor p of w, p is also a prime factor of v. Here I came to conclusion that both the statements are suff. D My friend said neither are because we dont know weather...
- by mchaubey
Wed Apr 14, 2010 3:14 pm- Forum: Data Sufficiency
- Topic: Integer or not
- Replies: 14
- Views: 1866
For a given tens digit, the greater the units digit, the smaller a percentage the bonus will represent. For instance, if the student scored 10 points, his 2-point bonus would be 20% of his base score. On the other hand, if the student scored 19 points, his 2-point bonus would be about 11% of his bas...
- by mchaubey
Mon Apr 05, 2010 4:11 pm- Forum: Data Sufficiency
- Topic: D.S Problem Solution need help
- Replies: 4
- Views: 1326
DS Problem
If a number n is pulled out of a hat at random, what is the probability that( 1/2)n - 2 ≥ 0?
(1) There are 6 numbers in the hat and each number is an integer.
(2) For every value of n in the hat, 1 ≤ n ≤ 30.
- by mchaubey
Fri Apr 02, 2010 3:06 pm- Forum: Data Sufficiency
- Topic: DS Problem
- Replies: 2
- Views: 1081