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Brain Teaser

There’s a kangaroo at the bottom of a 30 foot well. Each day he hops up three feet and slips back two. At that rate, how many days will it take him before he reaches the top and is out?

There’s a kangaroo at the bottom of a 30 foot well. Each day he hops up three feet and slips back two. At that rate, how many days will it take him before he reaches the top and is out?

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[–] • 3 pts

You win the prize! Your right, it’s 28 days. On the 27th day the kangaroo would have ascended 27 feet and the next day he would jump up three more feet and be out!