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cant get to match the OA

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Manager
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cant get to match the OA [#permalink]

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New post 30 Oct 2010, 02:46
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

40% (03:15) correct 60% (00:00) wrong based on 5 sessions

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OG12 PS Q95.

1/2+[(2/3*3/8)+4]-9/16=

29/16
19/16
15/16
9/13
0

i dont know what i am doing wrong i always endup with 67/16
[Reveal] Spoiler: OA
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Re: cant get to match the OA [#permalink]

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New post 30 Oct 2010, 05:45
yep you are right:

1/2+[(2/3*3/8)+4]-9/16=

1/2+[(1/4)+4]-9/16=

1/2+[17/4]-9/16=

8/16 + 68/16 - 9/16 = 67/16

If I go by the answer(0), I think the question should be:(notice the 4 is divided)

1/2+[(2/3*3/8)/4]-9/16=
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Re: cant get to match the OA [#permalink]

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New post 09 Nov 2010, 06:23
Replace +4 with -3/16 to reach upon desired answer...!! :P
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Re: cant get to match the OA [#permalink]

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New post 09 Nov 2010, 08:51
Answer: E
Explanation:
Actually the question is \(\frac{1}{2} + [(\frac{2}{3} * \frac{3}{8})/4]- \frac{9}{16}\)
==> \(\frac{8}{16} + [(\frac{1}{4})/4] - \frac{9}{16} = [\frac{1}{4} * \frac{1}{4}] - \frac{9}{16} + \frac{8}{16} = \frac{1}{16} - \frac{1}{16} = 0\)
Couldn't find the symbol for dividing, so used fraction symbol which is confusing but divide sign 4 = multiply sign 1/4.
Which is option E :)

Note: It was not +4 instead it was (small brackets values) sign of divide 4 inside the large brackets. (Be careful with signs on actual test)

Hope it helps!
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Re: cant get to match the OA   [#permalink] 09 Nov 2010, 08:51
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