Is the positive integer x a multiple of 3 ?
(1) x is a multiple of 27.
(2) x is a multiple of 9.
does someone know how to do this?
Multiple of X
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- goyalsau
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Viper83 wrote:Is the positive integer x a multiple of 3 ?
(1) x is a multiple of 27.
(2) x is a multiple of 9.
does someone know how to do this?
Answer should be D,
I) For a number to be a multiple of 27 , It must have at least 3^3 when we factor it to prime numbers, So it must be multiple of 3 ,
II ) Same as first for a number to be a multiple of 9 , It should have at least 3 ^2 in its prime factor form,
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answer to howViper83 wrote:Is the positive integer x a multiple of 3 ?
(1) x is a multiple of 27.
(2) x is a multiple of 9.
does someone know how to do this?
My approach would be
mind work every multiple of 27 should be multiple of 3
same for 9
take some value 27,54,108
45,54,90
way to check if it is divisible by 3 is
sum of number should be divisible by 3
ir 4+5=9
2+7=9
method 2:traditional one
x= 27 X some value
so 27 x some value /3 will be always integer until some value is integer as 27/3 will be always integer which means it will be always multiple
same for 9 ie 9/3 will always cancel
so should be D
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