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prindaroy wrote:are you sure it's simultaneously?

(x/10)(x/10) = 1/15, but you get x as sqrt(6.66667) and i'm pretty sure you can't pick part of a bulb
You are making a mistake. The equation has to be:

(x/10)[(x-1)/9] = 1/15

Then, just do your algebraic magic and X = 3 deffective bulbs.

by herjari

Wed Aug 12, 2009 6:57 am
Forum: Data Sufficiency
Topic: probability Q.
Replies: 10
Views: 1368

You can download the flashcards, which are very complete and for free!

Best wishes,

by herjari

Tue Jul 21, 2009 1:09 pm
Forum: GMAT Math
Topic: Formulae Sheet and speed math
Replies: 6
Views: 2405

Re: Please explain on some GMAT prep1 quant questions

Hi folks...I am not able Please chk the line in bold in question 1. It says which of the foll is equivalent to , let me rephrase: Which of the following choices will give you the same value as you get by [9]*[6] = 81, now [27] = 81 , hence the ans is D. Hope its clear now. Thank you VERY much for y...

by herjari

Tue Nov 25, 2008 4:32 am
Forum: Problem Solving
Topic: Please explain on some GMAT prep1 quant questions
Replies: 17
Views: 8246

Re: Exponent Question

shaden wrote: 2^(2--2) = 2^(2+2) =2^4 = 16?
Second option is the correct one.

What you have to remember is that 1/2^-2 = 2^2

Best wishes,

H

by herjari

Wed Oct 29, 2008 7:52 am
Forum: Problem Solving
Topic: Exponent Question
Replies: 2
Views: 1088

In order to clearly understand the answer to this problem, remember that EVERY student will study at least one language. Therefore, S- & F- has a 0 (zero) value in the matrix.

It took many several minutes to figure it out...

Best wishes!

by herjari

Mon Oct 27, 2008 4:28 am
Forum: Data Sufficiency
Topic: og ds 94
Replies: 5
Views: 1324