Data Sufficiency (DS) | Re: If a is a 3-digit integer and b is a 3-digit integer, is the units

a = xyz
b = def
z*f = gh , where h is the unit's digit ofz*f
=> h > 5 ?

1) z = 4, f = 1
z*f = 4 => h = 4
NO
But z = 4, f = 2
z*f = 8 => h = 8
YES
Insufficient.


2) f = 7, z = 1
f*z = 7 => h = 7
YES
But, z = 2, f = 7
f*z = 14 => h = 4
NO
Insufficient

1+2)
f = 7 , z = 4
z*f = 28
h > 5 => YES
Sufficient.

C
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