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Decimal

by ruplun » Fri Jul 15, 2011 7:57 am
What is the hundredths digit of the decimal z?

a. The tenths digit of 100z is 2.
b. The units digit of 1000z is 2.
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by krishnasty » Fri Jul 15, 2011 9:06 am
ruplun wrote:What is the hundredths digit of the decimal z?

a. The tenths digit of 100z is 2.
b. The units digit of 1000z is 2.
Let the number z be 0.abcdefg
We need to find the number b

(a) -> 100z = ab.cdefg and c =2. no idea of b. INSUFFICIENT
(b) -> 1000z= abc.defg and c =2 . SUFFICIENT

combining...it means the same...hence, INSUFFICIENT
IMO, E
Last edited by krishnasty on Fri Jul 15, 2011 10:52 am, edited 1 time in total.
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by Frankenstein » Fri Jul 15, 2011 9:22 am
krishnasty wrote:
ruplun wrote:What is the hundredths digit of the decimal z?

a. The tenths digit of 100z is 2.
b. The units digit of 1000z is 2.
Let the number z be 0.abcdefg
We need to find the number C

(a) -> 100z = ab.cdefg and d =2. no idea of C. INSUFFICIENT
(b) -> 1000z= abc.defg and c =2 . SUFFICIENT

IMO, B
Hi,
In 0.abcdefg, a is tenths digit and b is hundredths digit
So, we need to find b
a. 100z = ab.cdefg, c = 2. Insufficient to find b
b. 1000z = abc.defg, c = 2. Insufficient to find b

Hence, E
Cheers!

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by krishnasty » Fri Jul 15, 2011 10:51 am
sorry..included unit's place at the wrong side...
edited my post..
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