Cricket run rate - team X total runs

Team X scores N runs in 20 overs. Team Y tied the score in 10\% fewer overs: 20 - 2 = 18 overs. Team Y's standard run rate is therefore N/18. If Y's run rate were 50\% higher, the new run rate would be 1.5 × N/18 = N/12. At this new run rate, the time taken to score N runs is N \div (N/12) = 12 overs. Notice that the variable ⟨MATH⟩N⟨/MATH⟩ perfectly cancels out of the equation. The statement "the scores would have been tied in 12 overs" is a mathematical tautology that holds true for absolutely any value of N. Therefore, N cannot be found.

Answer: (d).