tonebeeze wrote:
Is z even?
(1) 5z is even
(2) 3z is even
z = integers, decimals, fractions, etc.
z = even ?
1) 5z is even
z = \(\frac{2}{5}\)
5z = 2, but z ≠ even.
z = 2
5z = 10, and z = even.
2 different answers. Insufficient.
2) 3z = even
z = \(\frac{2}{3}\)
3z = 2, but z ≠ even
z = 2, 3z = 6
z = even
2 different answers. Insufficient.
1+2)
5z = even and 3z = even
3 and 5 are prime => z cannot be a fraction as it has to satisfy both the equations.
=> z has to be even.
Sufficient. C is the answer.
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