Jim, Bob, Mike and Carlos are taking a road trip. At the first gas stop Jim pays $17 for gas. At the second gas stop Bob pays $1
4 for gas. At the third stop Mike pays $10. Finally at the end of the trip, Carlos buys $19 worth of gas. Now it’s time to settle up. If they are fair about sharing expenses, who owes money to whom?
<span>You would have to wait 318 years for 1/5 (20%) of the Radium to disappear. 1590 is the point where half of the Radium would decay, so if you take 20% of that, it would equate out to 318 years. Radium has a long half life!</span>
