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GMAT Prep 2 - number properties

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caramel3536: Senior | Next Rank: 100 Posts; Posts: 58; Joined: Sat Feb 02, 2008 10:13 pm

GMAT Prep 2 - number properties

by caramel3536 » Fri May 09, 2008 2:09 pm

Is the hundredths digit of the decimal d greater than 5?
(1) The tenths didit of 10d is 7
(2) The thousandths digit of d/10 is 7.

I'm totally lost on this one please help.

ans (d)

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Source: Beat The GMAT — Data Sufficiency | Fri May 09, 2008 2:09 pm

amitansu: Master | Next Rank: 500 Posts; Posts: 294; Joined: Tue Feb 26, 2008 9:05 pm; Thanked: 13 times; Followed by:1 members

by amitansu » Sat May 10, 2008 1:07 am

Assume d=x.abc
hundredth digit of decimal here is 'b'.

1: 10th digit of "10d=xa.bc " is "b" given 7

which is also 100th digit of d.sufficient

1: 1000th digit of d/10=0.xabc is "b"; given 7, so sufficient