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M20-28

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Math Expert
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Joined: 02 Sep 2009
Posts: 56303
M20-28  [#permalink]

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New post 16 Sep 2014, 01:09
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

84% (00:41) correct 16% (00:44) wrong based on 153 sessions

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Math Expert
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V
Joined: 02 Sep 2009
Posts: 56303
Re M20-28  [#permalink]

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New post 16 Sep 2014, 01:09
1
Manager
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Joined: 24 Nov 2013
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Re: M20-28  [#permalink]

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New post 13 Aug 2015, 01:22
another approach
9/2 = 4.5
4.5 is bigger than 1.125
Hence we can eliminate a & b.

check c now. 1.125 * 3 = 3.375 which is less than 4.5....hence 300% is also less.

try 400% (a easy number to deal)...
1.125 * (400/100) = 4.5...
this is the answer
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Re: M20-28  [#permalink]

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New post 09 Jul 2017, 00:38
I guess the quickest way to calculate it is by converting everything to fractions. Keeping one in fraction and another in decimal takes way too much time (Atleast for me)

Needed -

\(\frac{9}{2} = \frac{x}{100} * 1.125\)

\(\frac{9}{2} = \frac{x}{100} * (1+ \frac{1}{8})\)

\(\frac{9}{2} = \frac{x}{100} * \frac{9}{8}\)

\(x = 400\)

Answer Choice : E
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Joined: 31 Jul 2013
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Re: M20-28  [#permalink]

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New post 20 Oct 2017, 08:00
Another way to calculate:
9/2 = 4.5
1.125 * 2 = 2.25 * 2 = 4.5
9/2 > 1.125 4 times. 400%
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Re: M20-28  [#permalink]

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New post 21 Oct 2017, 23:55
+1 for E. the catch here is that 1.125 is 9/8. How ? 1/8 is 0.125. 1+(1/8) is 9/8. (9/2)/(9/8) is 400%.
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Re: M20-28  [#permalink]

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New post 11 Jul 2018, 23:08
Is this correct? 9/2 / 9/8 which is equal to 9/2 * 8/9?
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New post 11 Jul 2018, 23:20
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Re: M20-28   [#permalink] 11 Jul 2018, 23:20
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