Team X scored a total of N runs in 20 overs. Team Y tied the score in 10% less overs. Had team Y's average run rate (runs per over) been 50% higher, the scores would have been tied in 12 overs. How many runs were scored by team X?

Team Y ties N runs in 18 overs (10% less than 20). So Y's run rate = N/18. If Y's run rate were 50% higher, it becomes (N/18)×1.5 = N/12, and at this rate Y would score N runs in 12 overs — which is automatically true regardless of N. The condition is self-consistent for any value of N, so the actual number of runs cannot be determined from the given information.