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mgmat ps

by thephoenix » Sat Jul 10, 2010 4:42 am
4.896/(1/0.07 +1/0.16)
is approximately equal to:
.238
.262
.625
.649
6.25
need to know a gmat way to solve this one
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by Rahul@gurome » Sat Jul 10, 2010 4:57 am
1/0.07 = 100/7 and 1/0.16 = 100/16 = 25/4
100/7 + 25/4 = 14 + 6 = 20 (approximately), if actually divide the values then this value be more than 20
Therefore, 4.896/(1/0.07 +1/0.16) = 5/20 = 1/4 = 0.25(approximately)
So, the value of the expression will be less than 0.25 as the actual value of 100/7 + 25/4 will be more than 20.

[spoiler]The correct answer is (A).[/spoiler]
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by albatross86 » Sat Jul 10, 2010 5:08 am
Write 1/0.07 as 100/7 and 1/0.16 as 100/16

=> 4.896/(14.something + 6.something)
=> 4.896/21
=> 0.233

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