其它
The weights of four boys are 45kg, 48kg, 52kg and 53kg. Mason\textquotesingle s weight is an even number. Joshua\textquotesingle s weight is a multiple of 5. Christopher is not the heaviest and Mateo is not the lightest. Who is the heaviest among the four boys? 
Overseas Competition->Knowledge Point->Combinatorics->Logical Reasoning
Mason\textquotesingle s weight is an even number = 48kg / 52kg.  Joshua\textquotesingle s weight is a multiple of 5 = 45kg.  Christopher is not the heaviest = x 53kg.  Mateo is not the lightest = x 45kg  Jason - \textgreater{} either Mason or Christpoher is 28/52kg -\textgreater{} Mateo. 