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Two different numbers when divided by the same divisor left

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Intern
Joined: 05 May 2003
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Two different numbers when divided by the same divisor left [#permalink]

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17 May 2003, 08:30
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Two different numbers when divided by the same divisor left a
remainder of 11 and 21 respectively and when the sum of the numbers
was divided the remainder was 4. what is the divisor??
a) 36
b) 28
c) 14
d) 9

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SVP
Joined: 03 Feb 2003
Posts: 1603

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18 May 2003, 05:10
Given that:

R=kX+11
Q=mX+21
R+Q=nX+4
**************************************
Add P+Q=(k+m)X+32, which is equal to nX+4

32-4=28

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Intern
Joined: 05 May 2003
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20 May 2003, 07:53
just an extenion to your solution...
it could be either of 28 or 14 but since the remainder of 21 implied the divisor should be larger than 21 the anwer is 28

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Senior Manager
Joined: 19 May 2004
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30 Jun 2004, 11:01
Can someone please explain the solution to this problem ?

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Senior Manager
Joined: 21 Mar 2004
Posts: 445

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Location: Cary,NC

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30 Jun 2004, 12:49
Hi Dookie,

let the first no be x.

x/n = (an integer) + 11 = u + 11 - equation 1

similarly

y/n = (an integer) + 21 = v + 21 - equation 2

(x+y)/n = (an integer) + 4 = w + 4 - equation 3

eq1+eq2 = eq3 - equation 4

simplifies
n(u+v) + 32 = nw + 4 - here u,v,w are integers.

this means that n is a factor of 28.........bcoz n<=32-4 or n<=28

the factors of 28 are 14,7 etc.

since we have seen a remainder of 21 this means that n>21 , therefore n=28.

- ash
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ash
________________________
I'm crossing the bridge.........

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Manager
Joined: 08 Jun 2004
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Location: INDIA

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30 Jun 2004, 13:09
I substituted the numbers and got the ans as 28...

the easiest way with substitution...take a number that s more than 21 cos the least number that can divide 21 perfect =21 ...

take /37/28= reminder 11 and add 10 to this reminder and that wud get U 47 which gives a reminder of 21...

now 88/28 leaves a reminder 4...

hope that helps!

Have fun
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the whole worldmakes way for the man who knows wer he's going... good luck

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30 Jun 2004, 13:09
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