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total gmat math drill p25#4d explanation

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total gmat math drill p25#4d explanation [#permalink] New post 04 Apr 2013, 22:55
total gmat math drill p25#4d explanation

Is there an easy way to subract whole numbers and fractions from other whole numbers:

100 - 1 2/3 = 198 1/3

This was not intuitive to me - any suggestions welcome! Thanks
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Re: total gmat math drill p25#4d explanation [#permalink] New post 05 Apr 2013, 00:54
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Policarpa wrote:
total gmat math drill p25#4d explanation

Is there an easy way to subract whole numbers and fractions from other whole numbers:

100 - 1 2/3 = 198 1/3

This was not intuitive to me - any suggestions welcome! Thanks


Hi Policarpa,

Yes there could be another way to solve such a question.

1 2/3 is the same as 1 + 2/3

Therefore we can express the given expression as

100 - (1 + 2/3 )

= 100 - 1 - 2/3

= 99 - 2/3

= \frac{(99*3 - 2)}{3}

= \frac{(297 - 2)}{3}

= \frac{295}{3}

Hope this helps,

Vercules
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Re: total gmat math drill p25#4d explanation   [#permalink] 05 Apr 2013, 00:54
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