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Yup answer is D

Distance traveled by both the trains would be the same.

x * 4.5 = 3.5 * a (Let a = avg. speed of Z)

a = 9/7x

Hope this helps!

by raunekk

Tue Jun 12, 2012 5:40 am
Forum: Problem Solving
Topic: Rate problem!
Replies: 4
Views: 2388

IMO: A

17-13/13 = 30

What's the answer?

by raunekk

Tue Jun 12, 2012 5:28 am
Forum: Problem Solving
Topic: Square
Replies: 4
Views: 738

IMO : D = 20 a = 10 pound boxes b = 20 pound boxes a+b = 30 --- (1) 10(a) +20 (b) = 30* 18 ( given) 10a + 20 b = 540 --(2) Solving 1 & 2, a= 6, b = 24 To reduce average to 14 by removing some 20 pound boxes We use equation (2) to form new equation for average 14 10(6) + 20 (24-x) = 14 (30-x) ( Where...

by raunekk

Tue Jun 12, 2012 5:13 am
Forum: Problem Solving
Topic: Weight average
Replies: 2
Views: 740

@Bill Can you please explain me the bold line. I am finding it difficult to figure how it would increase by 0.2 I. If all 10 of the terms with even tenths digits have a tenths digit of 8, then rounding up to the nearest integer increases the term by .2 ; .2*10 gives a total increase of 2. If all 20 ...

by raunekk

Sat Apr 07, 2012 10:33 am
Forum: Problem Solving
Topic: List T OG
Replies: 7
Views: 4400

@Bill

Short and sweet!

Great approach!

Thanks

by raunekk

Fri Apr 06, 2012 5:15 am
Forum: Problem Solving
Topic: MGMAT probability - need expert help
Replies: 15
Views: 2046

@Bill

If the question would have mentioned - Red ONLY at the third time (not the first and second time), then the answer would have been :

NR-NR-R: 6/8 * 5/7 * 2/6 = 10/56

right?

Thanks in advance.

by raunekk

Thu Apr 05, 2012 3:17 am
Forum: Problem Solving
Topic: probability
Replies: 6
Views: 1084

Can there be a shorter method for this?

by raunekk

Tue Feb 21, 2012 2:09 am
Forum: Problem Solving
Topic: Counting....Challenging
Replies: 6
Views: 1100

Thanks Guys !!

The Answer is indeed 264,000

Guess I took too many variables and got confused in the process.

Thanks!

by raunekk

Wed Jun 15, 2011 3:15 am
Forum: Problem Solving
Topic: Average Problem
Replies: 6
Views: 2923

Average Problem

During 2005, a company produced an average of 2000 products per month. How many products will the company need to produce from 2006 through 2008 in order to increase its monthly average for the period from 2005 through 2008 by 200% over its 2005 average? 1) 148000 2) 172000 3) 200000 4) 264000 5) 28...

by raunekk

Wed Jun 15, 2011 1:32 am
Forum: Problem Solving
Topic: Average Problem
Replies: 6
Views: 2923

@Stuart Kovinsky

I agree with you!! It's from the question bank of one of the best GMAT coaching classes in India ( I wouldn't name the classes, but yes the language used is serious embarrassing!)

by raunekk

Tue Jun 07, 2011 9:48 pm
Forum: Problem Solving
Topic: 3 Alligations and Mixtures Sums
Replies: 9
Views: 40803

@ Frankenstein

Perfect!!

@cans

Can you explain me what is X in the 3rd one and how did u form equations using the same..

by raunekk

Tue Jun 07, 2011 9:39 pm
Forum: Problem Solving
Topic: 3 Alligations and Mixtures Sums
Replies: 9
Views: 40803

OA guys

1) [spoiler]1) 1:2[/spoiler]

2) [spoiler]a) 1:6[/spoiler]

3)[spoiler]d) 7 :9[/spoiler]

Thanks..

by raunekk

Tue Jun 07, 2011 9:35 pm
Forum: Problem Solving
Topic: 3 Alligations and Mixtures Sums
Replies: 9
Views: 40803

3 Alligations and Mixtures Sums

1) In what ratio must water be mixed with milk costing Rs 12 per liter to obtain mixture worth Rs 8 per litre? 1) 1:2 2) 2:1 3) 2:3 4) 3:2 4) 4:3 2) In what ratio must water be mixed with milk to gain 16 2/3 % (50/3%) on selling the mixture at the cost price? a) 1:6 b) 6:1 c) 2:3 d) 4:3 e) none of t...

by raunekk

Tue Jun 07, 2011 12:06 pm
Forum: Problem Solving
Topic: 3 Alligations and Mixtures Sums
Replies: 9
Views: 40803

HCF number pairs

Q) The number of number-pairs lying between 40 and 100 with their HCF as 15 is:

1)3
2)4
3)5
4)6
5)7

I tried the concept of consecutive multiples HCF, but not getting the answer.

OA [spoiler]2)4[/spoiler]

by raunekk

Sat May 21, 2011 11:12 pm
Forum: Problem Solving
Topic: HCF number pairs
Replies: 2
Views: 6634

But why did you do 2.S?

I mean, what was the thought process that you to that approach?

Thanks in advance!

by raunekk

Sat May 21, 2011 11:08 pm
Forum: Problem Solving
Topic: Find the sum
Replies: 4
Views: 4966