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What strategy would ensure that you drink 3 bottles of milk within 24 hours?

### Solution

This is a tricky interview question to get hired at **Google**.

Let’s solve the problem.

Hour **0 **: feed the rat bottle **one**.

Hour **1 **: feed the rat bottle **two**.

Hour **2 **: feed the rat bottle **three**.

You will get the answer when you time **10 hours** after each feeding which will inform you about the poisonous bottle.

If the rat lives past hour **12**, you will know it is bottle **four** .

Mathematically, you should get an answer in **12 hours**.

You can also get solutions by using less than **1 hour** in the previous steps.

Do you think that we have solved the problem ? **No** that’s not true, at the end you wouldn’t have **3** complete bottles, as the rat would have drunk a little bit from each tested bottle. So you’d have less than **3** bottles.

That was the trick! It is not easy to get hired at **Google**.

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Every problem you tackle makes you smarter.

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# Enjoy learning mathematics

Mathematics reveals its secrets only to those who approach it with pure love, for its own beauty.

**-Archimedes-**