You have a five cup mug, a three cup mug, a water supply, a sink with a drain, and a packet of instant coffee which when dissolved in one cup of water produces coffee of strength 100%.

The packet may be used at any time, but the entire contents of the packet must be dissolved into a single mug when it is used.

Your task is to fix 4 cups of coffee at exactly 16% strength.

(In reply to re: ummm.... by bin zhu)

I'm sure he knew that. He didn't say that the four cups would have coffee at 100% strength but that it would have 100 % of the contents of the packet. So when he ended with 64% in 4 cups of water that's 16% of the packet for each of the cups of water.

Posted by Danny on 2004-06-25 17:25:29