大神们走过路过不要错过，帮忙看两道数学题把~~~

If x and y are positive integers suchthat x = 8y + 12, what is the greatest common divisor of x and y ?

(1) x = 12u, where u is an integer.
(2) y = 12z, where z is an integer.

Statement (1) ALONE is sufficient, butstatement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, butstatement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient,but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOTsufficient.

What is the maximum possible length, incentimeters, of the shortest piece of wood?

90

100

110

130

140