View Full Version : Some calculation for you to excersice your mind.


davis
26-08-03, 15:19
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1) key-in the first 3 digit of your handy phone number into the calculator
2) multiply by 80
3) add 1
4) multiply by 250
5) plus last four digit of phone number
6) plus last four digit of phone number again
7) minus 250
8) divide by 2 at last

Is it your handy phone number???

*Can someone figure out and explain how the arithmetic works?

sk8ter
26-08-03, 17:09
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1) key-in the first 3 digit of your handy phone number into the calculator
2) multiply by 80
3) add 1
4) multiply by 250
5) plus last four digit of phone number
6) plus last four digit of phone number again
7) minus 250
8) divide by 2 at last

Is it your handy phone number???

*Can someone figure out and explain how the arithmetic works?



hah? i tried doing... i don't really geddit

tap
26-08-03, 23:59
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1) key-in the first 3 digit of your handy phone number into the calculator
2) multiply by 80
3) add 1
4) multiply by 250
5) plus last four digit of phone number
6) plus last four digit of phone number again
7) minus 250
8) divide by 2 at last

Is it your handy phone number???

*Can someone figure out and explain how the arithmetic works?


let the 1st 3 digits of your fone = X
let the last 4 digits of your fone = Y
1) =(X)
2) =(X)*80=(80X)
3) =(80X)+1=(80X+1)
4) =(80X+1)*250 = (20,000X+250)
5) =(20,000X+250)+Y=(20,000X+250+Y)
6) =(20,000X+250+Y)+Y=(20,000X+250+2Y)
7) =(20,000X+250+2Y)-250=(20,000X+2Y)
8) =(20,000X+2Y)/2=(10,000X+Y)

so ... no matter what your number is in X and Y ... the end results will be X(your 1st 3 digits) *10,000 which will make it 7 digits with 0000 behind plus Y (your last 4 digits) ... now 0000 plus Y = Y ...
therefore, the end results will always be 1st 3 digits and last 4 digits ....

phewww ...... get it ???

sam1741
28-08-03, 12:59
let the 1st 3 digits of your fone = X
let the last 4 digits of your fone = Y
1) =X
2) =80X
3) =(80X+1)
4) =(80X+1)*250 = (20,000X+250)
5) =20,000X+250+Y
6) =20,000X+250+Y+Y=20,000X+250+2Y
7) =20,000X+2Y
8) =10,000X+Y

so ... no matter what your number is in X and Y ... the end results will be X(your 1st 3 digits) *10,000 which will make it 7 digits with 0000 behind plus Y (your last 4 digits) ... now 0000 plus Y = Y ... therefore the end results will always be 1st 3 digits and last 4 digits ....

phewww ...... get it ???



ooo... so simple...

:D

moneyface
14-09-03, 03:13
let the 1st 3 digits of your fone = X
let the last 4 digits of your fone = Y
1) =(X)
2) =(X)*80=(80X)
3) =(80X)+1=(80X+1)
4) =(80X+1)*250 = (20,000X+250)
5) =(20,000X+250)+Y=(20,000X+250+Y)
6) =(20,000X+250+Y)+Y=(20,000X+250+2Y)
7) =(20,000X+250+2Y)-250=(20,000X+2Y)
8) =(20,000X+2Y)/2=(10,000X+Y)

so ... no matter what your number is in X and Y ... the end results will be X(your 1st 3 digits) *10,000 which will make it 7 digits with 0000 behind plus Y (your last 4 digits) ... now 0000 plus Y = Y ...
therefore, the end results will always be 1st 3 digits and last 4 digits ....

phewww ...... get it ???

TAP well done ~ ! you're da man !

jeyadev
15-09-03, 13:00
yea... most of these 'magical' arithmetic works like this...