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Schlumberger Oil Field Service Interview Question

I interviewed in Tulsa, OK and was asked:
"If you have a balance scale on a crane with 4 crates and you can only weigh two at a time, no more than three times, how do you figure out which crate has the least amount of weight?"
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Part of a Oil Field Service Interview Review - one of 925 Schlumberger Interview Reviews

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boxes: A B C D

1. Weigh a & b find the lightest
2. Weigh c & d find the lightest
3. Weigh the 2 lightest and pick the lighter box.

this is assuming that all the boxes are different weights..

- Doyle on Sep 4, 2012

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