If you had an infinite supply of water and a 5 quart and 3 quart pail, how would you measure exactly 4 quarts?

ANSWER BELOW:

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- Fill the 5 quart bucket from the spout.
- Using the water 5 quart bucket, fill the 3 quart bucket.
- Dump out the 3 quart bucket.
- Dump the remaining 2 quarts of water that is in the 5 quart bucket, into the 3 quart bucket.
- Fill the 5 quart bucket from the spout.
- Using the water 5 quart bucket, fill the remainder of the 3 quart bucket.

That leaves 4 quarts of water in the 5 quart bucket.