Brain teaser!
Myr's "Math Problem of the Week":
You are shipwrecked and captured by cannibals. Two hourglasses are given to you. One measures exactly four minutes, the other exactly seven minutes. The chief of the cannibals says you must tell when exactly nine minutes have passed. If you can do this, you may go free. If you can't -- you're dinner. The chief yells, "Start now!"
What do you do?
( Click for the answer )
You are shipwrecked and captured by cannibals. Two hourglasses are given to you. One measures exactly four minutes, the other exactly seven minutes. The chief of the cannibals says you must tell when exactly nine minutes have passed. If you can do this, you may go free. If you can't -- you're dinner. The chief yells, "Start now!"
What do you do?
( Click for the answer )