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If x, y, and z are positive integers and 3x = 4y = 7z, then

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If x, y, and z are positive integers and 3x = 4y = 7z, then [#permalink] New post 19 Oct 2006, 09:33
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A
B
C
D
E

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If x, y, and z are positive integers and 3x = 4y = 7z, then the least possible value of x + y + z is

(A) 33
(B) 40
(C) 49
(D) 61
(E) 84
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 [#permalink] New post 19 Oct 2006, 10:04
The answer should be a (D).The LCM of (3,4,7) will be the least number when all three will be equal which happens when
x=28
y=21
z=12

The sum of all three is 61.
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 [#permalink] New post 19 Oct 2006, 10:07
3x = 4y = 7z
Henec y=3*x/4 , z= 3*x/7
Hence x+y+z = 61*x/28.Hence answer has to be a multiple of 61.Which is (D)
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 [#permalink] New post 19 Oct 2006, 10:34
sangarelli wrote:
The answer should be a (D).The LCM of (3,4,7) will be the least number when all three will be equal which happens when
x=28
y=21
z=12

The sum of all three is 61.


and how do you come up with those numbers? pick numbers? It would be time consuming....
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 [#permalink] New post 19 Oct 2006, 12:16
No you just find the least common multiple of 3, 4, and 7 (which is 28) and then solve each equation and add.
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 [#permalink] New post 19 Oct 2006, 12:33
Got it at last :) I am slow :)

Had to clarify what the Least Common Multiple means in my language... Another gap in my knowledge was repaired , that is good :)
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 [#permalink] New post 19 Oct 2006, 12:50
burningskulls wrote:
No you just find the least common multiple of 3, 4, and 7 (which is 28) and then solve each equation and add.


Least common multiple cannot be 28...as 3 is not divisible by 28.

You need to find the least common multiple of 3, 4, 7 whch is 84 and then you get

x=28
y=21
z=12

= 61
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Easier method to solve this [#permalink] New post 20 Oct 2006, 11:27
3x = 4y = 7z
Thus will only work when 3 numbers are not divisioble by each other

x will be min 4*7=28
y will be 3*7=21
z will be 3*4=12

Add them up.

If the numbers where divisble by even 1 other number

LCM would be better way to go
Easier method to solve this   [#permalink] 20 Oct 2006, 11:27
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