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x and 18

by sanju09 » Fri Feb 19, 2010 1:17 am
What is x equal to?

(1) LCM of x and 18 is 36.

(2) HCF of x and 18 is 2.
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by ajith » Fri Feb 19, 2010 1:25 am
sanju09 wrote:What is x equal to?

(1) LCM of x and 18 is 36.

(2) HCF of x and 18 is 2.
1) Is not sufficient [ 4 and 18 have LCM of 36 so does, 12 and 18]

2) is not sufficient [ 4 and 18 have HCF of 26 so does 14 and 18]

Combining

LCM*HCF = x*18

36*2 = x*18

[spoiler]x=4, Sufficient , C[/spoiler]
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by thephoenix » Fri Feb 19, 2010 1:28 am
sanju09 wrote:What is x equal to?

(1) LCM of x and 18 is 36.

(2) HCF of x and 18 is 2.
its a st. formula

prod of two no=LCM * HCF of those no's
hence we need bth
so C sud be the ans
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by shashank.ism » Sun Feb 21, 2010 6:32 am
sanju09 wrote:What is x equal to?

(1) LCM of x and 18 is 36.

(2) HCF of x and 18 is 2.
St.1) LCM of x and 18 is 36. so x can be 4,12,36 or some other number too. as 18 = 2x3x3 ====not sufficient
St.2) HCF of x and 18 is 2 so x can be some even number ....like 2, 10 ,14, 26....
combined) x.18 = 36 . 2 --> x= 72/18 = 4
suff..
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