Let us assume that the number of goals scored by Rooney, Messi and Torres before the World Cup are R, M and T respectively. ∴ R + 7 = T and T + 8 = 2M From Statement A: R + M = 21 By solving the equations we get the values: R =9, M = 12 and T = 16. From Statement B: Absolute difference between goals scored by Rooney and Messi is 3. ∴R - M = 3 or M - R = 3. So either 'R = 21, M = 18 and T = 28’ or ‘R = 9, M = 12 and T = 16'. We do not get a unique set of values. Hence, the question can be answered by using Statement A alone but not by using Statement B alone.