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Topic: Grandpa and Grandma age?  (Read 28307 times)

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Offline Donaldson Tan

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Re: Grandpa and Grandma age?
« Reply #15 on: April 21, 2006, 12:25:36 PM »
LOL. One just have to travel back in time by (x-y) years, where x is grandpa's age and y is grandma's age.
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Offline Bakegaku

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Re: Grandpa and Grandma age?
« Reply #16 on: April 21, 2006, 09:24:58 PM »
admittedly I had to write some stuff down for this one  ;)

hmmm... no spoil tags on this forum.  Oh well.  I'll just space down a few times and hope Borek sees it fast so no one has their answer spoiled (assuming mine is right...  ;D)

[stuff deleted by Borek as usuall...]
« Last Edit: April 22, 2006, 05:24:39 AM by Borek »
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Offline swati

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Re: Grandpa and Grandma age?
« Reply #17 on: June 24, 2006, 05:32:49 PM »
Grandpa's  Age  =  75.6  yrs
Grandma's  Age  =  50.4  yrs

 ;)  It was not a difficult one.
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Offline Borek

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Re: Grandpa and Grandma age?
« Reply #18 on: June 24, 2006, 05:51:12 PM »
Quote from: swati on June 24, 2006, 05:32:49 PM
Grandpa's  Age  =  75.6  yrs
Grandma's  Age  =  50.4  yrs

 ;)  It was not a difficult one.

It was - this is not correct answer. Both ages are integer numbers.
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Offline billnotgatez

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Re: Grandpa and Grandma age?
« Reply #19 on: June 24, 2006, 07:26:24 PM »
Is this a fall spring marriage?
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Offline swati

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Re: Grandpa and Grandma age?
« Reply #20 on: June 25, 2006, 12:40:42 PM »
Borek , please tell me my mistake  :)

I have done it the following way
 Grandpa's age = x yrs
 Grandma's age = y yrs
        x   +   y   =  126           ---------- ( 1 )

(x-y) yrs ago
 Grandpa's age  =  x - ( x - y) yrs     =  y   yrs
 Grandma's age = [ y - ( x - y) ] yrs = [ 2y - x ] yrs
                   y  = 2 [ 2y - x ]
    =>           y  = 4y - 2x
    =>   2x - 3y  =   0                --------- ( 2 )
Multiplying ( 1 ) by 3 & then adding it to ( 2 ) , we get
                5x    =   378
    =>         x    =   75.6 yrs
    And        y    =   50.4  yrs             
               
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Offline Will

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Re: Grandpa and Grandma age?
« Reply #21 on: June 25, 2006, 01:22:03 PM »
This is the correct equation:
x = 2(y-(x-y))
which gives 4y-3x=0

Then you can put that into x+y=126
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Offline swati

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Re: Grandpa and Grandma age?
« Reply #22 on: June 25, 2006, 07:08:49 PM »
Quote from: Will on June 25, 2006, 01:22:03 PM
This is the correct equation:
x = 2(y-(x-y))
which gives 4y-3x=0

Then you can put that into x+y=126

 :(  Sorry I have made such a stupid mistake.

correct result deleted as usual ;)
« Last Edit: June 26, 2006, 03:27:20 AM by Borek »
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Offline technologist

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Re: Grandpa and Grandma age?
« Reply #23 on: June 26, 2006, 01:22:04 AM »
Borek,

Grand Pa will be a decade short in a century after the no of years the difference is there in their age.

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Offline hmx9123

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Re: Grandpa and Grandma age?
« Reply #24 on: June 26, 2006, 03:46:22 AM »
And if we go with the 'half plus seven rule' which states that the youngest person you can date is half your age plus seven years, grandpa currently sits within the limits.  So the next question is: at what age did grandpa finally fit that rule? :)  Then we should compare that to when they got married.  Sounds like grandma might be a gold digger (i.e., Anna Nicole Smith).
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