?

Log in

No account? Create an account
Aerden
aerden
.::.::...... ..


November 2017
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30

Aerden [userpic]
Amazing Math Problem!

This works for people with seven-digit telephone numbers.

1. Key in the first three digits of your phone number (NOT the Area code...).
2. Multiply by 80.
3. Add 1.
4. Multiply by 250.
5. Multiply the last four digits of your phone number by 2, and add that in.
6. Subtract 250.
7. Divide number by 2.

See what the result is!

How do people come up with this stuff?

Current Mood: surprisedamazed
Current Music: "Rhinestone Cowboy"
Comments

So call the first three numbers X and the last four Y.

2: 80X
3: 80X + 1
4: (80X + 1) * 250 = 250*80X + 250 = 20000X + 250
5: 2Y + 20000X + 250
6: 2Y + 20000X + 250 - 250 = 2Y + 20000X = 2*(Y + 10000X)
7: Y + 10000X = 10000X + Y

So, using 555-1212 as an example:
10000X = 5550000, Y = 1212
10000X + Y = 5551212

It's just a whole bunch of unnecessary arithmetic intended to confuse people. Once it's been simplified to what I show in 7 above, it's obvious.

You beat me to it. It's just a complicated math equation to get to a simple answer.

Most people won't look too closely at the math used to arrive at the answer, they're just mystified by the answer. There's one that goes around every couple of years that's supposedly based on the calendar year. IIRC, you start off with your age and this year as the input and in the end, it spits out your age and the year you were born. And it's always sent with an email message stating "this will only work for this year!" Yeah, the next year, you just add 1 to one of the first calculations, and voila!

It's a little like most of the "precognitive" web sites and puzzles that go around. They LOOK really mystical on first glance, but a little digging will quickly reveal the true nature of the (often simple) deception.

Bill--Hah! I knew there had to be a formula to it, somewhere. It's just too neat and tidy and consistent to not have some kind of formula behind it. Thanks for posting that!

Chantal

I think I screwed up because I didn't get my phone number :)