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GMAT Prep 2 - Decimals

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pradeepspanchal: Junior | Next Rank: 30 Posts; Posts: 28; Joined: Sun Aug 08, 2010 10:47 am

GMAT Prep 2 - Decimals

by pradeepspanchal » Mon Dec 13, 2010 9:25 pm

Although , it may be piece of cake for you , I got a doubt here.

In option A, the rounded value up-to thousandth is give, The thousandth value is 5 and hence the hundrth value will be increase by one , therefor .455 will become .46 and hence the result. and answer A .

As per my knowledge , if the last digit is either 5 or greater leads to the rounding and next number become one higher. eg . .457 after rounding to hundredth will become .46.

Because I got an incorrect answer , surly I in the wrong boat. Please highlight the mistake.
Thanks in advance

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Source: Beat The GMAT — Data Sufficiency | Mon Dec 13, 2010 9:25 pm

prachich1987: Legendary Member; Posts: 752; Joined: Sun Sep 12, 2010 2:47 am; Thanked: 20 times; Followed by:10 members; GMAT Score:700

by prachich1987 » Mon Dec 13, 2010 9:59 pm

pradeepspanchal wrote:

Although , it may be piece of cake for you , I got a doubt here.

In option A, the rounded value up-to thousandth is give, The thousandth value is 5 and hence the hundrth value will be increase by one , therefor .455 will become .46 and hence the result. and answer A .

As per my knowledge , if the last digit is either 5 or greater leads to the rounding and next number become one higher. eg . .457 after rounding to hundredth will become .46.

Because I got an incorrect answer , surly I in the wrong boat. Please highlight the mistake.
Thanks in advance

According to me the answer should be A.
From first statement, we can clearly conclude that x will be 0.46 after rounding to hundredth value
& it alone is sufficient unlike the 2nd one

But definitely we are doing something wrong.
Sm1 plz help

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goyalsau: Legendary Member; Posts: 866; Joined: Mon Aug 02, 2010 6:46 pm; Location: Gwalior, India; Thanked: 31 times

by goyalsau » Mon Dec 13, 2010 11:21 pm

pradeepspanchal wrote:
the rounded value up-to thousandth is give, The thousandth value is 5 and hence the hundrth value will be increase by one , therefor .455 will become .46 and hence the result. and answer A .

Ist statement
It says when rounded to nearest thousand then the result is .455 , value of x could be .4549 or .4551

When x is .4549, Rounded to nearest 100th then it is .45

when x is .4551 , Rounded to nearest 100th then it is .46

In sufficient

2nd Statement thousandth digit is 5,

This statement Confused me, Question says What is the result when x is rounded to nearest 100th, Now we know that thousandth digit is 5 so, when rounded to nearest 100th , it will definitely be +1 for 100th digit, No matter what is the digit at 100th place.

We know the result must be +1 on hundredth digit, According to me it should be sufficient.

I just don't understand why they need the value of x from 1st statement...............??????

x can be .455 or .445 or .435
Nothing particular
so insufficient

Saurabh Goyal
[email protected]
-------------------------

EveryBody Wants to Win But Nobody wants to prepare for Win.

Quote

prachich1987: Legendary Member; Posts: 752; Joined: Sun Sep 12, 2010 2:47 am; Thanked: 20 times; Followed by:10 members; GMAT Score:700

by prachich1987 » Mon Dec 13, 2010 11:38 pm

goyalsau wrote:
pradeepspanchal wrote:
the rounded value up-to thousandth is give, The thousandth value is 5 and hence the hundrth value will be increase by one , therefor .455 will become .46 and hence the result. and answer A .
Ist statement
It says when rounded to nearest thousand then the result is .455 , value of x could be .4549 or .4551

When x is .4549, Rounded to nearest 100th then it is .45

when x is .4551 , Rounded to nearest 100th then it is .46

In sufficient

2nd Statement thousandth digit is 5,

This statement Confused me, Question says What is the result when x is rounded to nearest 100th, Now we know that thousandth digit is 5 so, when rounded to nearest 100th , it will definitely be +1 for 100th digit, No matter what is the digit at 100th place.

We know the result must be +1 on hundredth digit, According to me it should be sufficient.

I just don't understand why they need the value of x from 1st statement...............??????

x can be .455 or .445 or .435
Nothing particular
so insufficient

I am a bit confused b the procedure of rounding the digits
I didn't understand the below
"When x is .4549, Rounded to nearest 100th then it is .45"
Is it right? According to me it should be 0.46 only.

Quote

goyalsau: Legendary Member; Posts: 866; Joined: Mon Aug 02, 2010 6:46 pm; Location: Gwalior, India; Thanked: 31 times

by goyalsau » Mon Dec 13, 2010 11:41 pm

prachich1987 wrote: I am a bit confused b the procedure of rounding the digits
I didn't understand the below
"When x is .4549, Rounded to nearest 100th then it is .45"
Is it right? According to me it should be 0.46 only.

go through this link it will be helpful for you.

https://mathforum.org/library/drmath/view/58938.html

Saurabh Goyal
[email protected]
-------------------------

EveryBody Wants to Win But Nobody wants to prepare for Win.

Quote

prachich1987: Legendary Member; Posts: 752; Joined: Sun Sep 12, 2010 2:47 am; Thanked: 20 times; Followed by:10 members; GMAT Score:700

by prachich1987 » Mon Dec 13, 2010 11:48 pm

goyalsau wrote:
prachich1987 wrote: I am a bit confused b the procedure of rounding the digits
I didn't understand the below
"When x is .4549, Rounded to nearest 100th then it is .45"
Is it right? According to me it should be 0.46 only.

go through this link it will be helpful for you.

https://mathforum.org/library/drmath/view/58938.html

Thanks it was really helpful
my all doubts regarding rounding are clear now.