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((-1.5)(1.2)-(4.5)(0.4))/30

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((-1.5)(1.2)-(4.5)(0.4))/30  [#permalink]

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New post 07 Jul 2018, 01:22
Hey adkikani

I think you are more confused because 0.4 is rounded to 0.5 whereas all other numbers (Eg: - 1.2 was rounded to 1) followed a different logic while rounding them up?

Think of it this way, 0.4 if it is rounded to 0, then the entire second half of the equation will become 0. Then the answer will be pretty inaccurate.

Hence I think we shouldn't reduce it to zero. Rather keep it as is or make it 0.5

Hope this helps
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Re: ((-1.5)(1.2)-(4.5)(0.4))/30  [#permalink]

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New post 13 Jul 2018, 14:13
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

\(\frac{(-1.5)(1.2)-(4.5)(0.4)}{30}\)

(A) -1.2
(B) -0.12
(C) 0
(D) 0.12
(E) 1.2


Simplifying we have:

(-1.8 - 1.8)/30 = -3.6/30 = -36/300 = -0.12

Answer: B
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Re: ((-1.5)(1.2)-(4.5)(0.4))/30  [#permalink]

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New post 06 Apr 2019, 20:59
GMATPrepNow ,


Could you elaborate on why these values are "very" spread apart? I can see from the equation the answer will be negative and with a little quick math you can see the number will be less than one, but my initial thought was not to estimate.

When you think about the "spread" of the answers are you thinking in just absolute magnitude or relative to each other. I.E. a question's "spread" with two answers: A:100 B=10 is equal to a questions with options A. .1 and B. .01?


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Re: ((-1.5)(1.2)-(4.5)(0.4))/30  [#permalink]

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New post 07 Apr 2019, 06:30
Top Contributor
5JUwiu4 wrote:
GMATPrepNow ,


Could you elaborate on why these values are "very" spread apart? I can see from the equation the answer will be negative and with a little quick math you can see the number will be less than one, but my initial thought was not to estimate.

When you think about the "spread" of the answers are you thinking in just absolute magnitude or relative to each other. I.E. a question's "spread" with two answers: A:100 B=10 is equal to a questions with options A. .1 and B. .01?


Thanks


When I think about the "spread" of the answer choices, I'm talking about relative to each other.
For example, the answer choices 0.01, 0.02, 0.04, 0.08 and 0.16 have a big spread, since each answer choice is TWICE the value of the answer choice before it.
I consider this spread identical to the following answer choices: 3, 6, 12, 24 and 48

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((-1.5)(1.2)-(4.5)(0.4))/30  [#permalink]

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New post 15 Apr 2019, 17:19
I feel that most if not all of the answers to this question do not really address how to do this quickly. It can be done very simply!

Let's break it down into small, digestible steps. Disregard the decimals!

(-1.5)(1.2) ... let's round this to -2

(4.5)(.4) means we need (2/5) of 4.5. Let's round this to -2 also.

So, because we have -4 in the numerator, that eliminates C,D and E.

So now it's between A and B. A could ONLY ever be the answer if the numerator had an absolute value greater than 30.

Answer must be B
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((-1.5)(1.2)-(4.5)(0.4))/30   [#permalink] 15 Apr 2019, 17:19

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