Number system question
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Source: Beat The GMAT — Data Sufficiency |
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kstv
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x is a multiple of 6 so x = 6a = 3*2*a
y is a multiple of 14 so y = 14b = 2*7*b
is xy a multiple of 105 = 7*5*3
from the data xy = 2²*3*7*ab
the missing factor is 5
1) x is a multiple of 9 = 3*3 not helpful. Insuff
2) y is a multiple of 25 = 5*5
the missing factor 5 to make xy a multiple of 105
IMO B.
y is a multiple of 14 so y = 14b = 2*7*b
is xy a multiple of 105 = 7*5*3
from the data xy = 2²*3*7*ab
the missing factor is 5
1) x is a multiple of 9 = 3*3 not helpful. Insuff
2) y is a multiple of 25 = 5*5
the missing factor 5 to make xy a multiple of 105
IMO B.
