This week's tangle is dedicated to the amazing strength of will that stopped me from succumbing to an infomercial yesterday. Said infomercial featured the *amazing* Ab-Circle Pro. They were on special! Everyone on the ad was so thin! And they promised me masses of weight loss in just three minutes a day. Three minutes a day. Heck, even I have that kind of time lying around.
However, just as I was reaching for the phone, the rational side of my brain spoke up (which was a damn-near miracle, since I could swear I'd left it chained to a radiator somewhere). So, long story short: I'm still as flabby as ever, but I'm loving that bonus three minutes a day that I don't have to exercise.
And what did I use today's three minutes for? Why, to furnish you with this week's tangle, of course...
Lose Ten Brain Cells in Nine Minutes!
Tanya is a sucker for TV infomercials. Her latest purchase is an exercise machine which, the sellers claim, will enable her to lose 10 pounds in one week. All she needs to do - so they say - is use the machine for nine continuous minutes each day.
On the first day, an enthusiastic Tanya throws on her track pants and searches the house for a timer. But all she can find is two old fashioned egg timers. The smaller egg timer takes four minutes for the sand to go through, while the bigger takes seven minutes for the sand to go through.
If Tanya cannot stop or slow down the sand while it is falling through the egg timers, how can she know when she has been exercising for nine minutes? (Presume that Tanya is able to flip the egg timer without getting off the machine, so it doesn’t interrupt her exercise.)
Solution: Tanya starts both egg timers at the same time, and begins exercising.
At the four-minute mark she turns the smaller egg timer over. She has been exercising for four minutes.
At the seven minute mark, she turns the large egg timer over. She has now been exercising for seven minutes.
At the eight minute mark, the small egg timer needs turning. But instead, Tanya turns over the large egg timer. Because it had been running for only one minute, when she turns it over, the sand in the large egg timer runs for exactly another minute in the other direction. At the end of this minute, when the large egg timer is finished, Tanya has been exercising for nine minutes.