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Let total (t) = a +b + c + d. We know that t = 9900, but lets keep it t for now a = (b+c+d)/2 = (t-a)/2, so a = t/3 Similarly b = (t-b)/4, so b = t/5 c = (t-c)x 2/3 = 2t/5 Putting it back in original equation, we have d = t - (a + b + c) = t - (t/3 + t/5 + 2t/5) = 9900 - 3300 - 1980 - 3960 = 9900 - ...

by kmittal82

Thu May 03, 2012 4:50 am
Forum: Problem Solving
Topic: need your help ratio problem
Replies: 3
Views: 1078

(1) Line could be y=0, which has a 0 slope but intersects the x axis at every point (basically, it is the x-axis) (2) Line x = 5 would be a straight vertical line at x = 5, so this means the line in the question stem is parallel to this, which means it must intersect the x axis at some point where x...

by kmittal82

Tue Apr 03, 2012 5:25 am
Forum: Data Sufficiency
Topic: Does line L intersect X-axis?
Replies: 2
Views: 2877

Ah, thanks guys.. looks like I didn't consider all the possibilities

by kmittal82

Wed Mar 21, 2012 8:41 am
Forum: Problem Solving
Topic: Stat Question
Replies: 6
Views: 10554

P(right handed glove) = 7/9
P(left handed glove) = 2/8

So, probability of 1 right handed glove and 1 left handed glove = (1/4) x (7/9) = 7/36

Whats the OA (and disagreement)? :)

by kmittal82

Wed Mar 21, 2012 7:00 am
Forum: Problem Solving
Topic: Stat Question
Replies: 6
Views: 10554

pappueshwar wrote:
for option A ) cant we do squaring on both sides and arrive at x-5 > 0 and hence X > 5 ? so that the answer is D
No, since this is an inequality.

Think of it this way, first condition is satisfied with both x = 4 and x = 6, but in one case the value of x is < 5, and in the other its > 5

by kmittal82

Wed Mar 14, 2012 8:26 am
Forum: Data Sufficiency
Topic: x>5
Replies: 1
Views: 584

dont u think it should be 5x4x4x3. at last quart we have 3 options because it has two adjacent quarts and colored used here can not be used Thats a good question, and made me think as well. But consider this, lets say we have 5 colours, ABCDE. Now, imagine filling in the circle in a clockwise fashi...

by kmittal82

Wed Mar 14, 2012 3:41 am
Forum: Problem Solving
Topic: counting probs help plz
Replies: 3
Views: 657

The circle is immaterial in this one, instead think of this question as how can you fill 4 boxes with 5 colours, with no 2 adjacent boxes with the same color. Here's a (bad) representation of the boxes |5 |4 |4 |4 | Now, first box can be filled in 5 ways, next one in 4 ways (since same colors cant b...

by kmittal82

Wed Mar 14, 2012 2:38 am
Forum: Problem Solving
Topic: counting probs help plz
Replies: 3
Views: 657

Let the minimum number of digits be x

Thus, total number of combinations (including repetitions) would be x^2

Now, we want x^2 to be atleast 15, thus x should be 4.

by kmittal82

Tue Mar 13, 2012 9:10 am
Forum: Problem Solving
Topic: Codes for local banks
Replies: 2
Views: 827

Rate = 5280 feet per 100x24 hours

So, feet per hour = 5280 / (100 x 24) = 11/5

Should be (B)

by kmittal82

Fri Mar 09, 2012 3:57 am
Forum: Problem Solving
Topic: rate
Replies: 3
Views: 1630

(1)
n = +- [ sqrt(2.89) x 10^5]

Ofcos, since k is positive, the negative root is eliminated, hence we are left with only 1 value for n

SUFFICIENT

(2)
Since k is an integer, only 1 value of k will satisfy the given inequality and will put n at 170,000.

SUFFICIENT

Hence (D)

by kmittal82

Mon Mar 05, 2012 9:02 am
Forum: Data Sufficiency
Topic: Exponents question- difficult
Replies: 5
Views: 763

I think this is where you are wrong: y^2 + 3 > y^2 The inequality sign would change if y is negative, so you can't really say the above is true, unless you know for a fact that y > 0 Thanks, but how can an inequality sign changes. Rules are if you multiply or divide an inequality by a negative numb...

by kmittal82

Thu Mar 01, 2012 8:41 am
Forum: Data Sufficiency
Topic: Please help
Replies: 5
Views: 875

Not sure about the cycles method, but its quick enough to deduce

1 -> 3
2 -> 9
3 -> 7
4 -> 1
5 -> 3
...
...

Following this, power of 12 should give us a last digit of 1

by kmittal82

Wed Feb 29, 2012 8:34 am
Forum: Problem Solving
Topic: 3^12- last digit
Replies: 2
Views: 634

I think this is where you are wrong:
y^2 + 3 > y^2

The inequality sign would change if y is negative, so you can't really say the above is true, unless you know for a fact that y > 0

by kmittal82

Wed Feb 29, 2012 2:57 am
Forum: Data Sufficiency
Topic: Please help
Replies: 5
Views: 875

Let no. of adult ticket sold = a Let no. of child tickets sold = c So, we are being asked if 12a + 8c > 20000, or in other words, is 3a + 2c > 5000 (1) a + c = 2000 This doesn't say anything about the numbers sold. If we assume equal number of tickets for each were sold (i.e. 1000 each), then the 3a...

by kmittal82

Tue Jan 31, 2012 3:22 am
Forum: Data Sufficiency
Topic: word problem
Replies: 1
Views: 466

(1)
6 copper coins and 3 brass coins are removed, which leaves 14 copper coins

SUFFICIENT

(2)
four of the first six are copper, remainder could be any combination of copper and bronze coins
INSUFFICIENT

Should be (A)

OA pls?

by kmittal82

Fri Nov 25, 2011 8:54 am
Forum: Data Sufficiency
Topic: Copper and Brass coins
Replies: 5
Views: 1004