http://threeacts.mrmeyer.com/25billionapps/act2/timer.pdf
Dan Meyer is having a contest on who will be the 25 billion person to buy an app on the app store. Every minute there is about 33,800 people that downloaded an app. Friday February 24, its 6:27 pm and there’s 24,658,507,655 apps downloads, a minute later there’s about 33,800 more apps downloaded. 16 minutes later there’s 24,659,054,476 apps downloaded. There has been 546,821 downloads in 16 minutes. In an hour at 7:27 pm, there has been 2,028,000 downloads so now there’s 24,661,082,476, but you should wait longer than an hour because it’s not close to 25 billion yet. A day later it would be Saturday February 25, 7:27 pm now there is 24,709,754,476 downloads. It’s still to early to update an app yet, so maybe lets wait one more day and see if we should download yet. Now it’s Sunday February 26 at 7:27 pm and now there’s 24,758,426,476, it’s still way to early, Lets wait 3 more days until we download an app. I multiplied 24 and 3 and I got 1,728 then I multiplied 60 and 3 and I got 180. Then I added 1,728 and 180 together and I got 1,908. Then I multiplied 1,908 and 33,800 together and got 64,490,400, now I’m going to add 64,490,400 to 24,758,426,476 and I got 24,822,916,876 and that is on March 1 at 7:27 pm. Were almost there lets try one more day. So it’s March 2 at 7:27 pm and we need to find how many updates there are today. So I multiplied 24 and 60 and I got 1,440 and now I multiplied 1,440 and 33,800 and I got 48,672,000. Then I added 48,672,000 to 24,822,916,876 and I got 24,871,588,876 it’s still to early to download, so lets wait 2 more days. 60*2=120. 24*2=48. 48*120=5,760. 5,760*33,800=194,688,000. 194,688,000+24,871,588,876=25,066,276,876. So now it’s to late to download so maybe we should wait a couple hours before 7:27 pm. So I think you should download an app on March 2 at around 4:30 pm because there’s 33,800 downloads per minute and if you divide 33,800 by 25,066,276,876 and you get 741,605 and then divide 741,605 by 33,800 and got 21. So I did the calculations and I think you should download an app on Tuesday March 2 around 4:30 pm and hopefully you will win.