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Is the hundredths digit of the decimal d greater than 5. 1.

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Is the hundredths digit of the decimal d greater than 5. 1. [#permalink]

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New post 14 Aug 2007, 11:14
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Is the hundredths digit of the decimal d greater than 5.

1. the tenths digit of 10d is 7

2. the thousandth digit of d/10 is 7

y is OA D here? i didnt understand this Q...pls explain
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Re: gmat prp cd parctice 2 DS [#permalink]

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New post 14 Aug 2007, 11:35
crazy123 wrote:
Is the hundredths digit of the decimal d greater than 5.

1. the tenths digit of 10d is 7

2. the thousandth digit of d/10 is 7

y is OA D here? i didnt understand this Q...pls explain


Say d=0.0x
(1) 10*d = 0.x
Knowing x=7, which is greater than 5.
SUFFICIENT.

(2) d/10 = 0.00x
Knowing x=7, SUFFICIENT.
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New post 14 Aug 2007, 19:05
It's all about moving the decimal around.

10D and D/10 is just sliding the hundredth decimal one spot each direction and telling you what number is. since 7 > 5 both are sufficient
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New post 14 Aug 2007, 22:37
St1:
The tenth digit of 10d is 7. So 10d = 0.7x. d = 0.07x. So the hundredth digit is 7.

St2:
d/10 = 0.007x and d = 0.07x. So the 100th digit is 7.

Ans D
  [#permalink] 14 Aug 2007, 22:37
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Is the hundredths digit of the decimal d greater than 5. 1.

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