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# Is the hundreths digit of the decimal d greater that 5

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Senior Manager
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Is the hundreths digit of the decimal d greater that 5 [#permalink]

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29 Nov 2006, 20:59
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Got this one right but would like to see how you guys solve it....

Is the hundreths digit of the decimal d greater that 5

1) The tenths digit of 10d is 7

2) The thousandths digit of d/10 is 7
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29 Nov 2006, 21:04
I am saying D

10d = moving decimal one place to the right means that .07*10=.7

d/10 = moving decimal one place to the left meaning .07/10 = .007

that is how it seems to me
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29 Nov 2006, 22:29
Is the hundreths digit of the decimal d greater that 5

1) The tenths digit of 10d is 7

2) The thousandths digit of d/10 is 7[/quote]

let d = x.abcd
10d=xa.bcd c is 7 suff

d/10= 0.xabcd c is 7 suff

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30 Nov 2006, 10:41
I get D also.

Let d = 0.0x, where x is the unknown digit.

from 1: the tenths digit of 10d = 7
10d = (10)(0.0x) = 0.x
if x = 7, then the 100ths digit is >5
SUFF

from 2: the hundredths digit of 10d = 7
d/10 = (0.0x)/(10) = 0.00x
if x = 7, then the 100ths digit is >5
SUFF

So, D.
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30 Nov 2006, 14:32
It's D.

Both options are sufficient to answer
30 Nov 2006, 14:32
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# Is the hundreths digit of the decimal d greater that 5

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