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Source: — Data Sufficiency |
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by stop@800 » Thu Oct 02, 2008 10:19 pm
(0.8)-5 / (0.4)-4

-4.2 / -3.6

4.2/3.6 = 42/36 = 7/6

Am I missing something in understanding the Q?
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by vishubn » Thu Oct 02, 2008 10:35 pm
i got he answer has 1/12.8

so i am sure it should be either A/B and the OA is B

and also out of curioisty i used a calculator to
the dvision of 5/64 and 1/12.8 and it is indeed true

but i dont know how to deduce in the form of answer chocies !!

Vishu
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by stop@800 » Thu Oct 02, 2008 10:37 pm
What am i missing?
i mean whats wrong in my explanation??


1/12.8
= 10/128 [remove decimal]
= 5/64
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Re: Powers

by Morgoth » Thu Oct 02, 2008 11:37 pm
vishubn wrote:(0.8)-5 / (0.4)-4 =
A. 3/32
B. 5/64
C. 1/2
D. 1
E. 2

i solved til lend but not able to relate it to the answer choices

vishu
(0.8)-5 / (0.4)-4

(0.8)-5 = 1/0.8^5 = 1/ (8/10)^5

(0.4)-4 = 1/0.4^4 = 1/(4/10)^4

1/ (8/10)^5 / 1/(4/10)^4 = (4/10)^4 / (8/10)^5

4^4 / 1 / (8)^5 / 10 = 10/(2^4 * 8) = 10/ (16*8) = 10/128 = 5/64.

Hope this helps.
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by Morgoth » Thu Oct 02, 2008 11:41 pm
stop@800 wrote:(0.8)-5 / (0.4)-4

-4.2 / -3.6

4.2/3.6 = 42/36 = 7/6

Am I missing something in understanding the Q?
I am not able to understand what have you done here.

0.8^-5 = 1/0.8^5 how this can be -4.2. no sure.
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by stop@800 » Thu Oct 02, 2008 11:45 pm
Morgoth wrote:
stop@800 wrote:(0.8)-5 / (0.4)-4

-4.2 / -3.6

4.2/3.6 = 42/36 = 7/6

Am I missing something in understanding the Q?
I am not able to understand what have you done here.

0.8^-5 = 1/0.8^5 how this can be -4.2. no sure.
I misunderstood power.
As "^" was missing so I took it as just a subtraction :(

So stupid mistake :)
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by vishubn » Fri Oct 03, 2008 6:02 am
Oh man !@@ i think my brains are blowing out ! sushc a stupid mistake i did !!

Stop@8000 thansk again !!

Vishu
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