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approximate value

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approximate value [#permalink] New post 05 Nov 2009, 07:34
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A
B
C
D
E

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Question Stats:

50% (03:44) correct 50% (03:30) wrong based on 2 sessions
whats the approximate value of 63888/3.31

1) 19300.50
2) 19300.75
3) 19301
4) 19301.25
5) 19301.50

Explain your process please.

Thanks
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Re: approximate value [#permalink] New post 05 Nov 2009, 08:02
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ghentu wrote:
whats the approximate value of 63888/3.31

1) 19300.50
2) 19300.75
3) 19301
4) 19301.25
5) 19301.50

Explain your process please.

Thanks


Well the the answers start with the same number 1930x in this case the x is 0 or 1

I multiplied 19300 x 3.31 and get 63883 (did this really fast on paper; well..because I can do that fast on paper)

subtract that from 63888 and you get a difference of 5
3.31 definitely goes into 5 so you know there is going to be a +1 = 19301.xx

leaves me with answers 3,4,5,

5 - 3.31 = 1.69

1.69/3.31 = .5xxx

19301.5xxx

answer e
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Re: approximate value [#permalink] New post 05 Nov 2009, 09:51
Excellent solution.

Thanks
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Re: approximate value [#permalink] New post 05 Nov 2009, 10:23
As all the answers are very nearer to each other

Multiply 19300 with 3.31 for the last two digits only

The last two digits are 83, but the last two digits of the dividend is 88.

So the difference is 5 means approximately 1.5 of 3.31

So add 19300 and 1.5 to get the answer 19301.5
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Affiliations: CA - India
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Schools: ISB - Hyderabad, NSU - Singapore
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Re: approximate value [#permalink] New post 05 Nov 2009, 23:51
great work... wonder y i couldn't think of this :cry:

Anyways +1 from me to legomez!!
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Re: approximate value [#permalink] New post 06 Nov 2009, 21:47
jade3 wrote:
As all the answers are very nearer to each other
5 means approximately 1.5 of 3.31


that was the masters stroke :-D

Thanks
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Re: approximate value [#permalink] New post 08 Nov 2009, 00:44
Simply dividing with some approximation should help you eliminate the options and reach the answer.. Btw good technique lagomez.
Re: approximate value   [#permalink] 08 Nov 2009, 00:44
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