The Question has been edited from x2-y2 => x^2 – y^2 ————————————– Is x^2 – y^2 a positive number? (1) x – y is a positive number. (2) x + y is a positive number. A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B) Statement (2) ALONE is sufficient, but [...]

The weights of all dishes of type X are exactly the same, and the weights of all dishes of type Y are exactly the same) Is the weight of 1 dish of type X less than the weight of 1 dish of type Y ? (1) The total weight of 3 dishes of type X [...]