t problem

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pradeepkaushal9518: Legendary Member; Posts: 1309; Joined: Wed Mar 17, 2010 11:41 pmFollowed by: 5 members; Thanked: 33 times

by pradeepkaushal9518 » Mon Apr 26, 2010 8:13 am

if t denotes the thousandth digit in the decimal representation of d above , what digit is t ?

1. if d were rounded to nearest hundredth, the result will be 0.44.
2. if d were rounded to the nearest thousandth, result will be 0.436

d=0.43t7

plz explain

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Source: Beat The GMAT — Data Sufficiency | Mon Apr 26, 2010 8:13 am

iamseer: Master | Next Rank: 500 Posts; Posts: 170; Joined: Wed Jun 10, 2009 5:59 am; Thanked: 13 times

by iamseer » Mon Apr 26, 2010 11:36 am

d=0.43t7

From 2:
when rounded to nearest 1000th, result is 0.436.Therefore t=5.
Since rounding off that last 7 (>=5) would increase the 1000th place by 1
SUFFICIENT

From 1:
when rounded to nearest 100th, result is 0.44
therefore t = 5,6,7,8 or 9
NOT SUFFICIENT

IMO answer B

"Choose to chance the rapids and dance the tides"

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pradeepkaushal9518: Legendary Member; Posts: 1309; Joined: Wed Mar 17, 2010 11:41 pmFollowed by: 5 members; Thanked: 33 times

by pradeepkaushal9518 » Mon Apr 26, 2010 5:30 pm

yr answer is correct i need explanation that u have given

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