### Brain Teasers

# Like Oil and Water

Imagine two jugs, the first containing one litre of oil, the second containing one litre of water. Ten millilitres is poured from the first jug into the second, and then ten millilitres is poured from the second jug into the first.

Which of the jugs now contains more of the liquid from the other jug? (Is there more oil in the second jug, or water in the first jug?)

Which of the jugs now contains more of the liquid from the other jug? (Is there more oil in the second jug, or water in the first jug?)

### Hint

Look at the category - this is not a Science teaser! It doesn't matter whether or not oil floats on water...### Answer

The first jug always ends up with the same amount of water as the second jug has oil.It doesn't matter whether more water or oil is transferred the second time. At the end, the total volume in each jug is the same, and the total volume of each liquid is the same. All that has happened is a certain (unknown) amount of oil from the first jug has been swapped with the same amount of water from the second jug.

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