1,if w,x,y and z are integers such that w/x and y/z are integers, is w/x+y/z odd?
(1)wx+yz is odd
(2)wz+xy is odd
2,is the three-digit number n less than 550?
(1)the product of the digits in n is 30
(2)the sum of the digits in n is 10
万分感谢！！！
这是GMATprep上的两题。 | 
